Vibration Help

[Supra88]

What happens if you put it on a two post lift and gradually increase the rpm's? It only has to be high enough to get the wheels off the ground. I had to replace an out of balance driveshaft on the 80. It was a bit tricky to find the problem. If one wheel starts to 'bounce' be careful it does not touch the ground. Why would we expect two driveshafts to have balance weights in similar positions?

I don't have access to a lift, but I have 4 jack stands. Could be a little sketchy, but I agree it could help identify the problem.

The vibrations can be felt in the both the driver's and passenger's seat, so it seems reasonable that it's not in the front wheels. I don't feel it in the steering wheel to the same degree as the seats. As far as the weight being in the same location, I would assume that Toyota had a standard for placing weights on the rear driveshaft. One on each end and one in another variable location. Just trying to confirm there's a 3rd weight. The fact that I have a shiny bare metal spot on the driveshaft and I have a vibration makes me hopeful this is it.

 

[afgman786]

So just to verify, you have a weight close the zirk and another one about 6" away?

That weight is smaller right? Maybe only a finger wide

 

[Supra88]

That weight is smaller right? Maybe only a finger wide

Yes the one by the zirk is smaller and has a similar weight at the other end of the driveshaft. So you're talking about a wider 3rd weight about 6" away?

 

[BrownDog09]

It’s the spacers and heavier tires. I took the spacers off and the problem is mostly gone.

 

[BrownDog09]

Duplicate post

 

[afgman786]

I've got some bad news... I completely missed exactly what you took a picture of..

 

[afgman786]

It’s the spacers and heavier tires. I took the spacers off and the problem is mostly gone.

Really? I'm running spacers and same size KM3s and its smooth

 

[Supra88]

I've got some bad news... I completely missed exactly what you took a picture of..

View attachment 2426127

Poop. Appreciate you crawling under there and checking.

 

[Supra88]

It’s the spacers and heavier tires. I took the spacers off and the problem is mostly gone.

I may try this to verify before throwing parts at it.

 

[BrownDog09]

I may try this to verify before throwing parts at it.

It’s a bummer I know. The truck just looks perfect with them on, but after my 3rd attempt at balancing Toyota was almost pleading for me to take them off. I took them off and ...wonder and surprise... no more vibration.

This experience had made me very very anti spacer.

 

[Supra88]

It’s a bummer I know. The truck just looks perfect with them on, but after my 3rd attempt at balancing Toyota was almost pleading for me to take them off. I took them off and ...wonder and surprise... no more vibration.

This experience had made me very very anti spacer.

Do you recall what speeds you had vibrations? Mine start at very low speeds, like 10 mph. I feel nothing at 75 mph.

 

[BrownDog09]

That is indeed quite a low speed to feel vibration. My vibration occurred around 50-65ish

 

[montegofd3s]

I would still pull the driveshaft, lock the center diff, and go drive. This will eliminate and DS balancing issues AND u-joint vibration from that shaft.

 

[Sandroad]

I had a vibration in my 100 that went away with new driveshafts.

 

[Supra88]

I've been doing some thinking on this vibration mystery and there are few things that make me believe that this is related to my LCA bushings.

The vibration starts to happen at very low speeds <10 mph.
I had zero vibration problems before the alignment shop admittedly torqued the LCAs while off load.

So I think I'm going to order up a set of LCAs and swap them in. Thought about doing the axles while I'm in there, not sure yet.

Is there anything else I should do "while I'm in there"? Sway bar bushing? etc?

 

[Sandroad]

But......you feel the vibes in your seat. That would seem almost for sure a driveline problem. If you've decided it's not the propeller shaft and you had the new tires road force balanced, I'd probably vote axles------damaged from the bad control arm install.

 

[Markuson]

It’s the spacers and heavier tires. I took the spacers off and the problem is mostly gone.

That makes no sense to me.
I’ve run spacers for years....i cludi g with very heavy 35’s and never any issues as you’re experiencing.

 

[Supra88]

But......you feel the vibes in your seat. That would seem almost for sure a driveline problem. If you've decided it's not the propeller shaft and you had the new tires road force balanced, I'd probably vote axles------damaged from the bad control arm install.

I don't disagree. I'm surprised I feel no vibration at 75 mph. I would think that a damaged axle would be very unhappy spinning at that speed. Without knowing I may just replace the LCAs and axles. Especially since I'm at 230k miles. Hate to throw parts at it, but not sure how to diagnose either of those components for vibration?

 

[BrownDog09]

That makes no sense to me.
I’ve run spacers for years....i cludi g with very heavy 35’s and never any issues as you’re experiencing.

It may not make sense - it’s what resolved my issue. I had no vibration before spacers and new Ridge Grapplers. Three balances, last was a road force balance with no resolution in vibration. Removed the spidertrax - almost no vibration. The spacers were installed properly and torqued to spec. Some people love them some spacers, for me it’s a non starter.

 

[04UZJ100]

I’d be hesitant to concede that improper torquing trashed the LCA bushings. That’s a lot of work and high dollar parts to change out especially if you’re unsure that’s the problem.

Jack the front end up and maneuver a long (4’+) pry bar around and through the front suspension components. There should be little if any play in all directions.

Check spacers again and/or remove them. As I recall there is a .5mm overbore on the hub. Clearances can stack and cause vibrations