bad vibration

[Irish_Alley]

lol thats why i have 3 trucks on the road and 3 others just sitting waiting for their turn

[Captain Swampy]

That's funny, Brooke was having withdrawals too. She had to survive a whole week. 

[philo_beddoe]

Yeah a second truck would do it. I'd love a 66.  I should have some news tomorrow.

[Greybeard]

I feel comforted just knowing mine is outside even if it isn't roadworthy right now. 12 weeks! Only 12 weeks before I graduate out of college (maybe anyway) and have time do what I want to do when I want to do it! The truck might not be the top priority but it will get it's fair share of my time. There is nothing that feels better than driving a SWB GM product with a healthy engine. New trucks just don't compare to the precision steering that a well set up old solid axle front end has. Well, at least my Dodge 2500 falls into that realm, it steers worse than a boat in rough water going slow.

My present problem with it is the cost of the lift kit, man have they skyrocketed! Nowadays one spring can be bought for about what I paid for my entire lift package plus the labor to install it back in 86. I am so far behind the times I get sticker shock too easy. Then I just say no way am I gonna pay that! But what choice is there? Rock..me....hard place.

[philo_beddoe]

Update,,,well it looks like some mounting bolts were not that tight, bushings worn and leaking, flexplate probably had a little stretch to it (no crack) but we are replacing it, and we are getting the t-converter balanced. Also, in front of the t-converter right below where you can see the rear main seal, there is a slot or hole where a shaft goes in if you have a manual tranny, actually I believe its in front of the flexplate, there is a sleeve in there that should only be there if in fact you do have a manual tranny, mine has it in it and it need to come out. It appears the engine may have been swapped at some point and was left in there. He showed me the small gear shaft that would normally go in there (for a manual t.). Also, I do have a th400 tranny, but the shaft/gear that sticks out where the end feeds into the drive shaft is, mine is very small, although a true th400 GM tranny, the last part of the tranny (not sure what you call it) was different on some transmissions. I have that one.

I hope I explained this right, and someone out there can understand it. Unfortunately, I don't have a one solid reason for the vibration such as a cracked flexplate. there were some uneven wear marks on the flexplate, however. the crankshaft was tight on both ends. May get truck tomorrow, and will know more then. Stay tuned.  PB.

[Greybeard]

Well, I have no idea what that slot or hole would be for. The pilot bushing for a manual tranny goes in the end of the crankshaft not under it. And if that what is there there no reason to remove it, it's not doing anything but keeping the hole clean. I cannot think of what would require a slot or hole under the crank location, normally it's just the top of the oil pan in that area unless the new metric engines are different? OK, I looked, I guess the newer SB's had a one piece seal. That still does not explain a hole or slot below the crank...

[zieg85]

    hope that combo of things made your issue but I doubt it.  Never heard of a torque converter being balanced but I am not an auto guy.  I can see if the pilot bushing didn't allow the torque converter to seat in the crankshaft all the way and the flex-plate was tweaked a bit when the 3 bolts were tightened.  Let us know when you get it back how it is.

[Captain Swampy]

Sure hope that fixed it. Like Zieg said, I think the torque converter goes into the end of the crank, so the pilot bearing may have been in the way. Fingers are crossed.

[Rattler12]

I don't think the torque converter and the pilot bearing have any relationship at all. The pilot bearing is there to stabilize the input shaft of a manual trans set up. The torque converter has no such shaft and just bolts to the flexplate. Jmtc's

[philo_beddoe]

Yes that would make sense, not below, but at the end of it,,,the crankshaft that is. We'll see....

[Peter S]

If I was a gambling man, I would bet on it being the harmonic balancer.

[Captain Swampy]

I think the round part in the center sticks into the end of the crank, in place of the pilot bearing.

[Greybeard]

The end of the torque converter does go in the end of the crank but I'm not certain the pilot bushing would get in the way of it since they are two entirely different sized diameters and the bushing is below the wider diameter of the opening.

[philo_beddoe]

I should have taken some pics when he showed me the other day. Then we'd all be on the same page. I should hear something tomorrow and i'll be sure to post a full report.

If this dont straighten out the vibration, then the balancer and motor mounts. And if that aint it, i'll be gone for a while.

[Captain Swampy]

And if that aint it, i'll be gone for a while.

To the bar?   LOL  Lets hope it's fixed