bad vibration

[zieg85]

Assuming by the Park/Neutral comment you have an automatic......Flex plate has a crack/cracks in it between one or more of the holes in the crank mounting surface......under power it wobbles, not it doesn't.....you can thank me later.....

Well it wasnt the tranny mount. Could be that flex plate/flywheel. I could swear it is starting to sound like a helicopter! Getting discouraged and depressed!! My engine mounts arent that great, but there is some rubber there.  Idk...

Just drive that jewel down to the St. Louis area and I will give it a good home...

I have been chasing a vibration myself.  They are frustrating but I know what isn't causing the problem...

[philo_beddoe]

Yeah we know a lot of things it aint. Next is probably the flywheel, then engine mounts. Or vice-versa.  Then if that aint it, i'll head over to st. Louis!!!

[philo_beddoe]

What do engine mounts cost, saw some at rock auto for like 7 bucks each. The bolt was 2 bucks.  Seems a good price?

Also, can someone send me a pic of what the right mount looks like for my vehicle? Never bought before.

[Captain Swampy]

Here's the whole thing, but the part inside can be replaced.

[philo_beddoe]

Got it, thanks.

[Captain Swampy]

I think the red one is the one your looking for. The piece inside the first picture.  This one is probably polyurethane, most likely Energy Suspension. The stock ones from Rock Auto should be fine. I agree with checking the flex plate, and would probably buy a new damper.

[Captain Swampy]

I wish my wife could take a ride in it. She is exceptional at locating noises and vibrations. Other than I have more experience than her, she is much better at diagnosing problems than me. If she had my experience, she would be twice the mechanic I am. We make a good team.

[Irish_Alley]

something else to think about is unbolting the torque converter and sliding it back a little. this will isolate just the engine. most times if a mout is back if you pop the hood and try to power brake the engine will raise up, these clam shell mount will limit the amount the engine can move but you should be able to have a helper help out and take note on how much they do move around

[Greybeard]

something else to think about is unbolting the torque converter and sliding it back a little. this will isolate just the engine. most times if a mout is back if you pop the hood and try to power brake the engine will raise up, these clam shell mount will limit the amount the engine can move but you should be able to have a helper help out and take note on how much they do move around

I had a knocking noise in the original 454 that was in my current truck. It had an automatic in it so I did that trick of taking the converter bolts out and moving it away from the engine. Still knocked. Had four different reasonably good home brewed mechanics go over that engine with a stethoscope but none of us could determine what was causing that knock. We could not even isolate where it was coming from. So I sold the engine to the speed shop that built my current SB. When he took it apart he could find nothing that was obviously wrong.    His best guess was that the thrust bearing was too thin allowing the crank to migrate forwards and backwards. That's all the diagnosing that he did however. Otherwise that engine ran really good.

[Greybeard]

As for vibrations, if there is no noise associated with it I would assume a dynamic imbalance situation. Like the balancer or fan that was already mentioned. Even though the distributor is new I would open it up and check the weights for free movement. Even a little bit sticky and the timing will be retarded enough to cause a miss resulting in a vibration.

[philo_beddoe]

I appreciate the feedback.. There is no noise or knocking at all. It seems to be getting worse, like i mentioned, seems like its starting to sound like a helicopter...like something big is causing it. Engine mounts are next, then pulling tranny to look whats going on down there. I have a tranny fluid leak at the t- converter, so it wont be for nothing, that seal will be addressed.

I'll be paying close attention to it next couple days, only going to work and back and i can go slow and take the back roads. I will address those ideas mentioned. Thanks!

Very discouraging!!

[bd]

...There is no noise or knocking at all.  It seems ... to sound like a helicopter....

 Huh?

[zieg85]

Helicopters are very noisy.  But I know the sound.  I would be willing to bet your pinion bearing is going...

[philo_beddoe]

What and where is the pinion bearing? Never had to deal with before..

I know, should have stated no knocking or metal type noise. Y'all know what i mean.

[Captain Swampy]

Brooke's torque converter seal was leaking, fluid was good color, so I had a new one installed. A month later, the tranny took a crap. We got one from GM through a dealer and put it in. Please consider the age of your tranny if you take it out. I paid someone to change the seal and then had to take it out again. I spent half as much as the tranny cost. Poop occurs!

Have you thought of oil sampling the engine oil? About 20-25 bucks. I don't care for the portable or bench units. Send sample to a lab. Most heavy truck dealerships or CAT dealers have the sample kits.