Post by: philo_beddoe on July 08, 2016, 01:00:20 PM
Noticed when changing u joints.
Post by: VileZambonie on July 08, 2016, 05:09:21 PM
Post by: hatzie on July 08, 2016, 05:52:56 PM
Without the yoke installed the output shaft is essentially missing the end bearing... Not sure how much play there's supposed to be but that video really doesn't shock me.
I don't think I'd worry if it's not making noise with the driveshaft installed.
Post by: philo_beddoe on July 08, 2016, 06:54:50 PM
Post by: philo_beddoe on July 09, 2016, 10:40:07 PM
Post by: VileZambonie on July 10, 2016, 08:01:02 AM
Post by: philo_beddoe on July 11, 2016, 06:55:23 PM
Post by: philo_beddoe on July 11, 2016, 07:06:47 PM
Oh, when i removed the dshaft, a little tranny fluid came out where the slip yoke goes. Is that ok?
Post by: VileZambonie on July 12, 2016, 08:41:01 AM
Post by: philo_beddoe on July 12, 2016, 01:32:43 PM
Post by: philo_beddoe on September 12, 2016, 09:51:56 PM
Is the driveshaft moving around in the tailshaft? Is the seal leaking? If so replace the bushing and seal.
Whoops, i just created another post on this topic, go ahead and delete "output shaft bushing". (Admin)
Anyway, ok, so how do we change that bushing and seal?
Post by: philo_beddoe on September 13, 2016, 07:40:50 AM
Post by: VileZambonie on September 13, 2016, 11:06:10 AM
Post by: philo_beddoe on September 13, 2016, 12:48:57 PM
If it still does it after the new bushing i'm leaving truck in your driveway!! Lol
Post by: zieg85 on September 13, 2016, 12:57:49 PM
Post by: philo_beddoe on September 13, 2016, 01:06:43 PM
Oh, my exhaust system is very tight btw.
Post by: zieg85 on September 13, 2016, 01:25:58 PM
Post by: philo_beddoe on September 13, 2016, 01:32:40 PM
Post by: philo_beddoe on September 14, 2016, 01:42:36 PM
Post by: philo_beddoe on September 16, 2016, 10:49:20 AM
Post by: Irish_Alley on September 16, 2016, 03:09:51 PM
Post by: philo_beddoe on September 16, 2016, 04:37:23 PM
Oh, the dshaft shop did the quick fix. They said my dshaft was modified at some point, i think shortened, the welds are different. Thus...new shaft.
Post by: LTZ C20 on September 16, 2016, 10:09:07 PM
Post by: philo_beddoe on September 16, 2016, 10:19:36 PM
I like to go as far as i can before i throw in the towel. Lol
Post by: LTZ C20 on September 16, 2016, 11:19:39 PM
Post by: philo_beddoe on September 17, 2016, 11:17:09 AM
Post by: philo_beddoe on September 17, 2016, 09:14:05 PM
Post by: philo_beddoe on September 19, 2016, 05:07:38 PM
Post by: philo_beddoe on September 24, 2016, 09:17:00 PM
Driveshaft
Front yoke and bushing
U-joints
I can still feel a vibe down there. And i'm all out of ideas. At wits end!!! Now i need some help. I can no longer do or think of anything else.
Post by: zieg85 on September 24, 2016, 09:50:04 PM
Post by: Irish_Alley on September 25, 2016, 07:06:24 AM
Post by: VileZambonie on September 25, 2016, 08:08:29 AM
Post by: philo_beddoe on September 25, 2016, 07:16:02 PM
Irish, i noticed a few posts where i mentiond "the vibe". I have a habit of doing that.
Anyway, the other posts were stuff i did to the old dshaft, ujoints, etc. but now i have a brand new driveline. Its not anything in engine, of course. Not ps pump or alt or anything up there. If its in the rear-end vile will figure that out. If its a wheel, i'll soil myself. Lol,,,but its not a wheel, then it would shimmy and always be present.
Post by: philo_beddoe on September 26, 2016, 07:45:01 AM
Post by: philo_beddoe on September 26, 2016, 12:18:56 PM
Post by: MrFiveOh on September 26, 2016, 01:40:39 PM
Post by: philo_beddoe on September 26, 2016, 02:04:04 PM
Post by: MrFiveOh on September 26, 2016, 06:47:24 PM
Through the seat. The tranny mount was the first thing i replaced. I wonder if its the pitch or angle of the dshaft? Anyone know how to check? Whats normal? I wonder if adding 200 lbs in the rear of the bed will do anything...
If its in the seat your vibration is coming from the rear. I noticed your truck is lifted or stock height(?) check your pinion angle possibly? When i had the vibration i changed
rims/tire
u-joints
new wheel bearings and differential bearings
balanced driveshaft
and finally transmount which fixed it.
Post by: philo_beddoe on September 26, 2016, 07:16:39 PM
Post by: philo_beddoe on September 27, 2016, 08:36:30 PM
Saw at the Big E, got a free Chevy T-shirt.
(http://uploads.tapatalk-cdn.com/20160928/d9aa8511555baf39703616df95a5c82b.jpg)
Post by: Rattler12 on September 27, 2016, 09:35:58 PM
Post by: philo_beddoe on September 28, 2016, 08:16:12 AM
I really wonder if it's inside the tailshaft housing somewhere, imo the tailshaft had too much movement. I know the the front slip yoke hold in place, but still seemed like a lot of movement. We did change bushing though.
I would love to try a powerglide just to see. I have a deep gut feeling this problem is due to the tranny. Not necessarily the tranny itself, but DUE to the tranny if this makes sense. I have a TH400 with a 350 output. It shifts great up and down. I know its not the engine area and it just doesn't "feel" like its in the rearend area, not the wheels, not the exhaust and not the driveline. Now what?? I'm getting tired of thinking.
Post by: philo_beddoe on September 28, 2016, 08:23:41 AM
When I'm done with my construction, if you want to stop by we can go for a ride so I can see what you're talking about.
Vile, it seem to lighten up or change a little half way to work. But once I get on 84 and up above 55, there it is. So we may have to go on I-84, maybe stop at the new DD in Tolland. I'll buy.
Post by: VileZambonie on September 28, 2016, 06:06:02 PM
Post by: Irish_Alley on September 28, 2016, 06:16:10 PM
Post by: VileZambonie on September 28, 2016, 06:20:08 PM
Post by: philo_beddoe on September 28, 2016, 10:34:19 PM
I am on an intense permanent diet. Very little sugar, no salt, very limited animal products, and mostly fruits, vegs, beans, nuts and seeds. Ever since reading a brand new book (# 1 best seller) by Dr. Joel Fuhrman called "The end of heart disease", very simple and makes great sense. BTW, all sugar is sugar, even local quality honey and pure maple syrup. Which is a bummer, i love both of those.
Post by: Irish_Alley on September 28, 2016, 10:50:48 PM
Post by: LTZ C20 on September 28, 2016, 11:10:24 PM
Post by: philo_beddoe on September 29, 2016, 09:20:57 AM
Post by: philo_beddoe on September 29, 2016, 09:28:40 AM
Maybe the tranny mount is too thick??
Post by: philo_beddoe on September 29, 2016, 02:27:08 PM
Could be rear end area?
Post by: philo_beddoe on September 29, 2016, 04:59:33 PM
Post by: LTZ C20 on September 30, 2016, 12:25:00 AM
Post by: philo_beddoe on September 30, 2016, 07:37:17 PM
Post by: philo_beddoe on October 03, 2016, 03:19:03 PM
Post by: zieg85 on October 03, 2016, 03:43:45 PM
Post by: philo_beddoe on October 03, 2016, 05:22:31 PM
Post by: philo_beddoe on October 03, 2016, 05:25:08 PM
Post by: MrFiveOh on October 04, 2016, 08:19:22 AM
just had wheels balanced, rotated and correct psi done. still have vibe, i'm starting to think rear end? maybe it is those front wheels after all. i'll have vile check it. (what am i paying him for)?!!! lol.
If your vibrations are in your seat it has to do with the rear of the vehicle. I know ive said this once but ill say it again.
Trans Mount
U joints
Balanced Drive shaft
Drive line Angle
Bent Rim (just cause they balance it doesnt mean it isnt bent) (do a road force balance)
Loose Exhaust set up
Out of round tire ( i know you got it balanced, but i had brand new tires i balanced 5 times before i realized they were out of round and made a complaint to the tire company. Got new tires and fixed the issue)
Post by: philo_beddoe on October 04, 2016, 05:17:48 PM
Post by: Irish_Alley on October 05, 2016, 02:33:31 AM
Post by: philo_beddoe on October 05, 2016, 07:29:52 AM
Post by: zieg85 on October 05, 2016, 08:30:50 AM
Post by: philo_beddoe on October 05, 2016, 12:26:04 PM
Have you rotated the tires front to back?
Yes.
Post by: MrFiveOh on October 05, 2016, 01:02:27 PM
Post by: philo_beddoe on October 05, 2016, 02:48:35 PM
Post by: MrFiveOh on October 05, 2016, 03:49:57 PM
Just replaced last spring, brand new. Oh how i wish it was that !
Just cause its new doesn't mean its good......
Post by: philo_beddoe on October 05, 2016, 04:09:20 PM
(http://uploads.tapatalk-cdn.com/20161005/a3aa0a87d753d6023a7d966ea7f5745b.jpg)
(http://uploads.tapatalk-cdn.com/20161005/11a911b8e01ca6f4cd6775e80b69aba5.jpg)
Post by: Rattler12 on October 05, 2016, 09:34:14 PM
Post by: Irish_Alley on October 06, 2016, 02:58:06 AM
Post by: philo_beddoe on October 07, 2016, 07:39:07 AM
Post by: jg1977c20 on October 07, 2016, 07:19:26 PM
How tight are your exhaust system hangers?
i was just going to say ................ check the exhaust - i have flowmaster 40,s on and they give of some weird vibes going to lose those real soon . but i had to place pieces of rubber where the hangers attach to keep the reverberation down .
Post by: philo_beddoe on October 11, 2016, 09:26:07 AM
It is NOT consistant, sometimes pulsating, sometimes steady, and sometimes is is really light and hard to detect.
Post by: philo_beddoe on October 11, 2016, 11:03:05 AM
Nope, not tranny. Just went to a solid tranny shop and showed them the video here, he said that is way too much play. Thats my problem. Does anyone agree from the video.
But this is what Vile posted, so i dont know.
https://r.tapatalk.com/shareLink?url=http%3A%2F%2Fforum%2E73-87chevytrucks%2Ecom%2Fsmforum%2Findex%2Ephp%3Ftopic%3D32734%2Emsg280084%23msg280084&share_tid=32734&share_fid=15802&share_type=t&share_pid=280084
But i am starting to believe it is nothing between the grille and rear U-joint.
Post by: philo_beddoe on October 11, 2016, 05:16:35 PM
Sent from my iPad using Tapatalk
Post by: VileZambonie on October 11, 2016, 06:56:42 PM
Post by: philo_beddoe on October 12, 2016, 10:42:29 AM
Post by: gwcrim on October 13, 2016, 09:44:26 AM
I'm rarely out on the highway to hit 75 for long periods but last weekend I took a road trip. 300 miles of interstate. The vibration comes on around 73 and goes away around 77. Sometimes it's bad, sometimes not.
I'm 95% sure it's my brand new rear end. You've checked everything else. Have someone check that.
Post by: philo_beddoe on October 13, 2016, 01:47:02 PM
Post by: philo_beddoe on October 14, 2016, 09:04:07 PM
I guess this modern video from chevrolet motor division explains the basics on limited slip.
https://m.youtube.com/watch?v=K4JhruinbWc
Post by: SkinnyG on October 14, 2016, 09:58:21 PM
I have a cyclic driveline vibration that peaks at about 48mph. It is worst when the vehicle is cold. I don't notice it in 2nd gear, but it's sure there in 3rd. It's cycle varies depending on throttle position.
Post by: philo_beddoe on October 15, 2016, 06:59:34 AM
The only area i never addressed was the rear axle/bearings, rear diff. That may be good news, perhaps. I'll keep updating this thread.
Post by: fitz on October 15, 2016, 11:49:14 AM
The true mechanics on here that have real trouble shooting skills may laugh at this, but let me through this out there. You make the call.
I have a 10 bolt (6 lug) rear axle (complete drum to drum) you can have.
I also have 2 of the 6 lug rally wheels (with junk tires on them).
You can have it all for free (I'm 30 minutes south of Boston, not to far from you).
Bolt in the 10 bolt (with new u bolts) and buy 2 cheap tires (which you can sell on Craigslist after), and you can play the process of elimination game.
Then again, you can drop the truck off at Vile's house and let him work his magic on it.
Post by: Irish_Alley on October 15, 2016, 02:52:18 PM
Post by: fitz on October 15, 2016, 05:17:14 PM
To add to the confusion I think most of my 10 bolts are from 90-91 blazers & suburbans so they would be 30 spline axle shafts.
They all came from running & driving trucks. If it did solve the vibration it would keep his truck drivable until he gets his original 12 bolt rebuilt.
Post by: philo_beddoe on October 15, 2016, 05:25:52 PM
(http://uploads.tapatalk-cdn.com/20161015/234e2e665f7292f9985430f63d4970e2.jpg)
Post by: philo_beddoe on October 15, 2016, 05:38:39 PM
In my case 12 to 10. I am grateful for the offer fitz, let me see what this shop comes up with on tuesday. Could be something simple like bearings. They are a Jasper rear end dealer.
http://www.jasperengines.com/differentials
Post by: Irish_Alley on October 15, 2016, 05:45:53 PM
Post by: philo_beddoe on October 15, 2016, 05:51:39 PM
Post by: MrFiveOh on October 16, 2016, 08:54:21 PM
Post by: philo_beddoe on October 16, 2016, 09:25:41 PM
Thanks for the reply though. I have a feeling i dont get much replys on this problem, either folks are sick of the thread or its just too difficult to pinpoint. I should learn a lot this week though. Will post results.
Post by: SkinnyG on October 16, 2016, 11:02:26 PM
I notice mine feels like it will come back or go away if I turn a corner. This would indicate a bent or imbalanced wheel to me, but I have checked and re-balanced my wheels. Problem is still there with my winter wheels and tires too.
I ~did~ balance my brake drums - one needed 5oz of weight - but the sticky weights fell off this summer. I will machine the heavy lip down to balance it this fall, but I'm not convinced that's the problem.
My exhaust is very tight, but still compliant. Using typical universal hangars at the back of the cab and at the tail pipes.
I've raised the tail of the transmission, and shimmed the every which way but fixed on the diff, no solution.
I had the front u-joint (a brand new "Precision" joint) go south in a hurry - I replaced it with a Spicer which made a difference. The rear still seems tight, but I have a Spicer in the glove box for when I'm feeling frisky.
I have flipped the driveshaft 180°, and I've swapped pinion yolks to no avail.
I've tried different flexplate (broke the factory one), rebuilt the entire back axle (all new everything), and recently rebuilt the trans (it popped).
I ~do~ have poly motor, trans, cab, and suspension mounts, so I certainly will feel a whole lot more.
Post by: Irish_Alley on October 17, 2016, 12:04:19 AM
Post by: MrFiveOh on October 17, 2016, 08:02:42 AM
Factory config. single exhaust. Not touching anything. I wish it were that!
Thanks for the reply though. I have a feeling i dont get much replys on this problem, either folks are sick of the thread or its just too difficult to pinpoint. I should learn a lot this week though. Will post results.
Im just as curious as you are, issues like this are the reason i like groups like this. I like troubleshooting and eventually someone down the line will have the same issue. Obviously it isnt an issue we have dealt with before based on process of elimination, so im really curious as to what it is.
Post by: philo_beddoe on October 17, 2016, 11:16:25 AM
im not tired of it but i think youre on the right trail now and its the only thing left. so im just waiting to hear you say "fixed"
Well thanks for the encouragment! Ya know irish, your right...everything has been addressed, except what lies behind the rear ujoint and between the rear wheels. I will have a long conversation with the shop tomorrow. I'm not going to rule out anything, but there is strong evidence as to what it is NOT. I never thought of unbalanced drums or raising tail end of tranny. I will certainly mention that.
I will keep this thread updated. And if and when solved, all will know. I will include a summary of the problem and all the trials right to the end.
I have a strange feeling Vile Z. will have his hands on it last.
Post by: philo_beddoe on October 18, 2016, 08:33:22 AM
Post by: zieg85 on October 18, 2016, 09:14:20 AM
Post by: philo_beddoe on October 18, 2016, 01:14:56 PM
I know Vile is usually against "stacking washers" lol
Post by: zieg85 on October 18, 2016, 03:04:09 PM
Post by: philo_beddoe on October 18, 2016, 03:46:10 PM
How about 1 or 2 rubber washers on one side of the tranny mount? Just to see? I'm tempted.
(http://uploads.tapatalk-cdn.com/20161018/98ebe1decc652562bc9f14f8bb1dda82.jpg)
Post by: philo_beddoe on October 18, 2016, 04:17:55 PM
Attached is a pic of my simulated heavy passenger i had this morning. 4-60 pound sand bags, 240 lbs.
Note: no offence if you weigh 240 or more.
Anyway...took a long drive and it felt like it did this morning, real smooth! I'm too exited to think. Someone tell me whats going on? What do i need to adjust? Perhaps a different size tranny mount? Stack some washes somewhere??? Help, and thanks!
(http://uploads.tapatalk-cdn.com/20161018/3fed91adb31dad3f4a556b78759dddc6.jpg)
Of course....i'm going to drive around with my simulated passenger for a few days. I've been bamboozled before!
Post by: MrFiveOh on October 18, 2016, 04:22:17 PM
Before the new engine, i had a new tranny mount installed. But, i cant remember if i had this vibe before that. The old engine vibe was so bad that it superceded this one.
How anout 1 or 2 rubber washers on one side of the tranny mount? Just to see? I'm tempted.
(http://uploads.tapatalk-cdn.com/20161018/98ebe1decc652562bc9f14f8bb1dda82.jpg)
Maaaaan, i said trans mount the very first time... lol
Post by: philo_beddoe on October 18, 2016, 04:27:18 PM
VILE!!! "Oh where could he be?"
Post by: Irish_Alley on October 18, 2016, 05:37:27 PM
Post by: philo_beddoe on October 18, 2016, 06:17:37 PM
I have a hunch the tranny mount is too thick.
Post by: zieg85 on October 18, 2016, 06:59:57 PM
Ok, but i do know that the slip yoke is well in there, the new dshaft is almost an inch longer than the old one, plenty of grab.
I have a hunch the tranny mount is too thick.
Check to see how centered your fan is in the shroud. If you are a lot closer to the bottom your engine is tilted and you may be right
Post by: philo_beddoe on October 18, 2016, 08:48:07 PM
Just checked, its even all around. Maybe tail end of tranny is tilted on one side....slightly?
Post by: philo_beddoe on October 19, 2016, 07:20:47 AM
I'm starting to get confused again, what in the world could be warming up AND with the weight on the pass side cause the vibe to totally go away? Or maybe something is not warming up? I'm going to drive with the weight on the pass side for a few days, try to develop a pattern.
Post by: MrFiveOh on October 19, 2016, 08:32:40 AM
Well, on the way into work this morning I did feel the typical vibe (like an in and out drone), it wasn't very prominent, but it was there (with my 240 lb. simulated pass). My commute to work is 11 miles, which includes about 1.5 miles of hwy. About half way to work I could hardly feel it, then on the hwy it was so smooth, felt like a brand new caddy, no vibe whatsoever. And it was never that smooth w/o the weight on the pass side.
I'm starting to get confused again, what in the world could be warming up AND with the weight on the pass side cause the vibe to totally go away? Or maybe something is not warming up? I'm going to drive with the weight on the pass side for a few days, try to develop a pattern.
Id say drive it until something actually breaks, My vibration drove me crazy but it didnt affect the actual performance of my truck. Eventually i found it though, im sure you will too. Keep giving updates and im sure something will come up.
Post by: philo_beddoe on October 19, 2016, 11:02:04 AM
Post by: MrFiveOh on October 19, 2016, 11:39:29 AM
That was one theory i was considering. But i get annoyed when things arent perfect. If my dome light burns out, why even drive the truck! Lol
I understand that. I know my truck and when the slightest thing changes it bugs until i figure it out.
Post by: philo_beddoe on October 19, 2016, 05:02:08 PM
Post by: VileZambonie on October 19, 2016, 05:22:20 PM
Post by: philo_beddoe on October 19, 2016, 07:48:00 PM
How are your body mounts?Not exactly new rubber, but not rotted out either. How many are there, i'll double check.
Post by: philo_beddoe on October 19, 2016, 07:51:54 PM
(http://uploads.tapatalk-cdn.com/20161020/f0b0096c1a17f9626b4169ac104928a4.jpg)
This pic is with the added weight, post 103 is without.
(http://uploads.tapatalk-cdn.com/20161018/98ebe1decc652562bc9f14f8bb1dda82.jpg)
Post by: gwcrim on October 19, 2016, 08:12:26 PM
Id say drive it until something actually breaks...
That's how I feel about my vibration. I'll get to finding it. If it goes first? Hope it's not catastrophic.
Post by: philo_beddoe on October 19, 2016, 08:51:03 PM
Post by: 1967KaiserM715 on October 19, 2016, 09:16:13 PM
Sent from my iPhone using Tapatalk
Post by: Rattler12 on October 19, 2016, 09:17:53 PM
Post by: philo_beddoe on October 20, 2016, 07:01:21 AM
Post by: philo_beddoe on October 20, 2016, 10:19:02 PM
Post by: SkinnyG on October 20, 2016, 10:48:17 PM
One area I've been starting to go down, is ignition timing. Since I don't notice any vibration in 2nd (same road speed), I'm wondering if the advance at that point is maybe too much for the engine, and it's not happy, inducing a vibration. I'll be trying some different advance springs over the next while to see.
Post by: philo_beddoe on October 21, 2016, 06:24:23 AM
One thing that confuses me with mine, is the inconsistentness of it. If it was consistent, I would be quicker to blame a mechanical issue. Driveshaft vibrations should ~always~ be there.
One area I've been starting to go down, is ignition timing. Since I don't notice any vibration in 2nd (same road speed), I'm wondering if the advance at that point is maybe too much for the engine, and it's not happy, inducing a vibration. I'll be trying some different advance springs over the next while to see.
I agree with your first paragraph 100%. Mine is not continuous or constant and that is what confuses me, if it were physical or mechanical and always present, i guess it be easier to pinpoint. Generally when active, it is an in and out pulsating drone. rrhummm---rrhummm---rrhummm... which fools me again, because that points to mechanical like something not level or balanced.
I'm going to keep messing with the tranny mount, and rule that out.
I know the basics on ignition timing, but i have no idea how it could relate to the kind of vibe i'm getting. I dont get it in 2nd also, or under a relatively hard accell. Mine is at its worst when you let off on the pedal, crusing speed, but not taking foot off the pedal. If im doing say 55, and quickly drop in neutral, the vibe quickly dissapates.
Post by: Rattler12 on October 21, 2016, 08:30:04 AM
Post by: SkinnyG on October 21, 2016, 08:59:54 AM
The cyclic vibration is throttle dependent too. Somewhat temperature dependent. Inconsistent on the road.
Too much ignition timing may make the engine try to fight against combustion sort of, and may make the engine more rough. I recently dropped my vacuum advance limiter from 12° to 10°, but that didn't matter. If I disconnect and plug the vacuum entirely, I would know for sure.
Hmmmm.... 2nd gear would have a significantly different amount of gas flow through the exhaust, which would move the gas flow out of the harmonic zone. Hmmm......
Post by: philo_beddoe on October 21, 2016, 09:12:29 AM
What would the vibration be like if you had NO tranny mount? Continuous i assume. But not a pulsate in and out?
Post by: philo_beddoe on October 21, 2016, 11:04:31 AM
Oh, and the only reason I didn't use the mounting bolts to the tranny is because I don't have a stinkin 15mm open end/box wrench. That's embarrassing.
Post by: VileZambonie on October 21, 2016, 11:11:51 AM
Post by: philo_beddoe on October 21, 2016, 11:16:45 AM
Post by: Irish_Alley on October 21, 2016, 01:10:08 PM
Post by: philo_beddoe on October 21, 2016, 03:11:32 PM
Post by: philo_beddoe on October 22, 2016, 10:32:25 PM
Post by: philo_beddoe on October 25, 2016, 08:12:41 AM
Post by: philo_beddoe on October 29, 2016, 10:18:37 PM
Post by: SkinnyG on October 30, 2016, 09:12:37 AM
Mine usually starts lightly around 25mph and becomes more pronounced around 45mph, and then pretty much stops after 50mph.
If you can let Vile have the truck for a week, where he can drive it every day, I'm sure it would rear its ugly head whilst he has it.
Post by: philo_beddoe on October 30, 2016, 07:02:42 PM
Post by: SkinnyG on October 30, 2016, 07:54:18 PM
Someone (here?) had mentioned poorly setup gear pattern will cause a vibration. My truck had a vibration peaking around 62mph with 3.07 gears and the old axle. I swapped in an entirely new housing with all (and I mean ~all~) new guts and 3.73 gears, and the vibration moved from around 62mph to around 50mph. That's leading me to believe it's not my rear end.
I still haven't changed out the rear "Precision" brand u-joint to the Spicer recommended by my local truck shop. They say they refuse to install anything but Spicer because nothing else is precise enough. It's on my list of (more) things to try.
Post by: Captain Swampy on October 30, 2016, 07:58:40 PM
Post by: philo_beddoe on October 31, 2016, 08:54:38 AM
Do you have another vehicle to drive? Then you could ask Vile if he would use it as his daily driver until he experiences the vibration, whether it takes a week or two. Maybe offer some gas money. All you can do is ask. I wish I was closer, my wife is exceptional at pin pointing noises and vibrations. I hope you locate it soon.
Thanks Capt. for the reply. Sure wish you and a few others on this site were my neighbor. Brook's truck is coming along nice! Yeah, I think VZ can probably pin-point it pretty quick. He's not the type that loafs around on a Sat., he has a busy schedule. But, he's 20 min. down the road, I'll catch him soon enough. As soon as I have it diagnosed, well, that's half the battle, not knowing is the worst part of it. Like I mentioned before, I believe it lies between the two wheels somewhere.
I'm wondering if I should just have the whole rear diff and axle rebuilt, or looked at anyway. Like, just do it and see what happens.
Post by: philo_beddoe on November 01, 2016, 12:45:01 PM
That tells me nothing is out of balance. But perhaps something is worn somewhere. But what changes causing it to go smooth now and then?
Post by: philo_beddoe on November 05, 2016, 03:14:57 PM
Post by: philo_beddoe on November 06, 2016, 10:03:17 PM
Post by: SkinnyG on November 06, 2016, 10:58:05 PM
Post by: MrFiveOh on November 07, 2016, 07:57:01 AM
Would you be willing to air your laundry here?
X2 kinda hard to have a 10 page post and not give end result to the issues.
Post by: philo_beddoe on November 07, 2016, 08:03:19 AM
Would you be willing to air your laundry here?Lol,,,no- VZ is going to work on what i cant. Probably over the next year or so we'll tackle one little issue at a time. Although i do day dream of a 2017 chevy truck. But debt is dumb and cash is king!
Post by: kopeck on November 07, 2016, 08:31:46 PM
I've been lurking and watching this thread since you started it so I guess I'm curious as well.
Just work away at it one issue at a time. These trucks are pretty darn forgiving..
K
Post by: philo_beddoe on November 07, 2016, 09:39:03 PM
Basically, the epicenter is the transmission. How I don't know, I brought the truck to a good tranny shop a while back and they swore it couldn't be in the tranny, that there's nothing in there that "could" cause a vibration. Somehow though I always kinda knew it was coming from there.
Anyway, in addition, there are other factors involved. Such as:
1. The entire rear-end is a little loose, due to normal wear, but no real issues or danger.
2. The dshaft is a little long, which I can have shortened easily enough.
3. I need an exhaust spring kit installed. Which will eliminate any harmonic resonance.
4. My wheels a tucked too far into the body, I need to install spacers and bring them out a little, I'm not changing rims or tires, I love the old man stock look. I hate the redneck supped-up high performance look. That's just my personal preference.
5. I need to install an idler arm. Then a front end rebuild someday, okay now though.
6. New Body mounts needed.
Everything else is pretty good. He stated he ran the truck on the lift with dshaft removed, no load and can pinpoint the worst vibrations coming from the tranny. I am not surprised.
I think VZ said he has another TH400 and possibly a 2 piece dshaft. Although since I just got a new dshaft made, I'd like to keep it. We'll see.
So that's it, pretty much pin-pointed to the tranny, although she shifts great. Oh well. I'll be happy when I'm driving down the road smoothly. May even shop around for a new 4 speed.
I'll keep this thread going as these issues get resolved.
Post by: kopeck on November 08, 2016, 11:25:46 AM
Curious about the wheel spacing though, do you have something narrower then stock going on or do you just prefer to get them moved out a bit to a more modern looking stance? My truck looks very similar to yours, when I was younger I didn't like the wheel spacing now I think it's cool, a by gone period. Or maybe I'm just a dork. :-)
K
Post by: philo_beddoe on November 08, 2016, 04:48:27 PM
Yah, cant wait to change out that tranny! It's all i think about now.
Post by: zieg85 on November 08, 2016, 05:01:59 PM
Just prefer to move them out a bit. Still maintaining the stock look.
Yah, cant wait to change out that tranny! It's all i think about now.
I've had 15x7 steelies that your style hubcap would fit. Came from an older full sized Caprice. They looked better than the 15x6 that you have now
Post by: kopeck on November 08, 2016, 05:45:28 PM
Just prefer to move them out a bit. Still maintaining the stock look.
Yah, cant wait to change out that tranny! It's all i think about now.
Gotcah, makes sense. Like I said I'm a dork. ;)
Seems like you should be able to find another TH350 pretty easily and for short money or just get the one you have fixed. I had a freind that had one checked over a few years ago and it didn't cost him a ton. Then again if yours is really bad then parts might start to add up...
K
Post by: MrFiveOh on November 08, 2016, 05:52:00 PM
Just prefer to move them out a bit. Still maintaining the stock look.
Yah, cant wait to change out that tranny! It's all i think about now.
Gotcah, makes sense. Like I said I'm a dork. ;)
Seems like you should be able to find another TH350 pretty easily and for short money or just get the one you have fixed. I had a freind that had one checked over a few years ago and it didn't cost him a ton. Then again if yours is really bad then parts might start to add up...
K
goog grief, youre running 15x6 all the way around. Gotta get them 15X8 man.
Post by: SkinnyG on November 08, 2016, 08:41:42 PM
Post by: philo_beddoe on November 08, 2016, 09:36:46 PM
What is the exhaust spring kit - is that for at the factory manifolds?Yes, where it connects at the manifold. I'll get that done at some point.
Post by: philo_beddoe on November 08, 2016, 09:37:25 PM
Post by: SkinnyG on November 08, 2016, 10:54:53 PM
Post by: philo_beddoe on November 09, 2016, 09:36:39 AM
Well, make one change at a time, and report back as you go. Do the cheapest/easiest fixes first. I'm looking forward to hearing your results.
Thanks skinny, best reply i had in a while. Good advice.
Post by: philo_beddoe on November 10, 2016, 07:57:12 AM
Post by: philo_beddoe on November 16, 2016, 03:39:50 PM
Oh, and thanks to VZ...again.
Ps. I know i already mentioned the tranny, but today i took the drive shaft in to re-size, and ran it w/o the shaft, as Vile mentioned he did also, smooth as butter in park. In neutral and drive....there it was!!
1. Smooth in park=not engine or TC
2. No dshaft=not driveline or rear end(obviously).
3. Hmmm, whats left? Bingo!
Post by: MrFiveOh on November 17, 2016, 09:36:04 AM
We're starting to break ground! The monster has been isolated and revealed itself. Stay tuned...So this confirms its the trans? not the flex plate or torque converter?
Oh, and thanks to VZ...again.
Ps. I know i already mentioned the tranny, but today i took the drive shaft in to re-size, and ran it w/o the shaft, as Vile mentioned he did also, smooth as butter in park. In neutral and drive....there it was!!
1. Smooth in park=not engine or TC
2. No dshaft=not driveline or rear end(obviously).
3. Hmmm, whats left? Bingo!
Post by: philo_beddoe on November 17, 2016, 02:12:00 PM
Not sure, but perhaps its the front shaft .
Post by: philo_beddoe on November 18, 2016, 10:32:13 AM
Post by: SkinnyG on November 18, 2016, 09:54:48 PM
Post by: philo_beddoe on November 18, 2016, 10:03:54 PM
Post by: VileZambonie on November 19, 2016, 07:34:58 AM
Quote
Thus rust, vibrations and rattles really get my goat.
Yet you own a 40 year old truck that has all of the above.... :o
Post by: LTZ C20 on November 19, 2016, 09:07:04 AM
A smack down of WWE proportion hahahahahaQuoteThus rust, vibrations and rattles really get my goat.
Yet you own a 40 year old truck that has all of the above.... :o
Post by: philo_beddoe on November 19, 2016, 02:12:50 PM
Thats it, i'm getting a barf bag!QuoteThus rust, vibrations and rattles really get my goat.
Yet you own a 40 year old truck that has all of the above.... :o
Its a work in progress, (probably for life)
Post by: VileZambonie on November 19, 2016, 05:03:11 PM
Feels nice. I had to stop because my wife had to leave for the Hospital. Unfortunately her grandfather is not doing well. I am re positioning the exhaust and putting in a flex pipe. It's unacceptable the way it is and too far forward over the rear axle. I'll adjust the timing and reset the carburetor too. If all goes well it'll be done tomorrow.
Post by: VileZambonie on November 19, 2016, 05:04:41 PM
A smack down of WWE proportion hahahahahaQuoteThus rust, vibrations and rattles really get my goat.
Yet you own a 40 year old truck that has all of the above.... :o
Owned
Post by: philo_beddoe on November 19, 2016, 05:55:48 PM
what do you mean probably?
Feels nice. I had to stop because my wife had to leave for the Hospital. Unfortunately her grandfather is not doing well. I am re positioning the exhaust and putting in a flex pipe. It's unacceptable the way it is and too far forward over the rear axle. I'll adjust the timing and reset the carburetor too. If all goes well it'll be done tomorrow.
Ok, here we go...
On one hand i'm super exited and thrilled beyond measure.
On the other....i may need a barf bag.
$$$$$$
No complaints, i appreciate your efforts. Take your time, send me a text when ready.
Post by: philo_beddoe on November 19, 2016, 06:13:08 PM
(Had to edit)
Post by: SkinnyG on November 19, 2016, 10:58:45 PM
Post by: philo_beddoe on November 20, 2016, 08:16:30 AM
So..... different trans, then?
I sure hope so...
Post by: philo_beddoe on November 21, 2016, 12:46:16 PM
I haven't driven the truck yet, but no doubt I'm sure it drives like it did in 77'. I'll post the results later and put an end to this "driveline v*******n" thread. :D
Post by: philo_beddoe on November 21, 2016, 09:20:03 PM
! All good though. Lol..
Post by: SkinnyG on November 21, 2016, 09:26:45 PM
Post by: zieg85 on November 21, 2016, 09:27:14 PM
Post by: philo_beddoe on November 21, 2016, 09:54:05 PM
I would be very interested in what it was in the trans that caused the vibration.So would i! I actually forgot to ask. Either he'll catch this and post something, or i'll ask him at some point.
Post by: VileZambonie on November 23, 2016, 11:30:18 AM
Post by: philo_beddoe on November 23, 2016, 03:11:19 PM
I gave the old one to one of the teachers. Told him next time he teaches transmissions to see who let the goose loose in there.That institution gets all my old parts! Lol..
Post by: Captain Swampy on January 16, 2017, 03:44:58 PM
Post by: philo_beddoe on January 30, 2017, 01:01:22 PM
Post by: SkinnyG on March 08, 2017, 10:54:00 PM
While I was 100% confident that my cyclic vibration was caused by the driveline and not the engine, it seems I may have been drunk all that time. It ~was~ coming from the engine. The engine was rebuilt 3 years ago, and properly assembled, and I had paid good coin to have the guts balanced before I assembled it. Apparently I made a note that I noticed a cyclic vibration once I replaced the beat up cab mounts with poly mounts.
Seeing that the engine was the cause, I tried altering both the fuel and spark to see if it was a tuning issue. Nothing.
This weekend, I swapped out the POLY motor mounts to new RUBBER mounts, and the vibration was >much< reduced. Monday I swapped the POLY trans mount back to a new RUBBER one, and the vibration is GONE.
And there we go.
Didn't find the ~source~ of the vibration, but I don't feel it, so I'm going with that.
ps: I'm enjoying your bodywork pics!
Post by: philo_beddoe on March 13, 2017, 09:37:08 PM