2019 389 driveline vibration

Did you

Did anyone figure this out I have a 2020 and it’s doing it. The dealer just replaced the carrier bearing and that was not the problem.

 

Yes. Rush Peterbilt in Tulsa, Oklahoma. The drive line angles were off.

 

I'm wondering also if anyone has nailed this down? Had vibration since new and been down this path for 2 years. Been on/off vibration analyzer at least 5 times. To date: adjusted ride height several times, diff angles checked/rechecked, shimmed, clutch replaced, 2 u joints replaced, new updated hanger bearing, new driveline yoke to yoke, driveshaft shortened and transmission balancer installed. Got word yesterday that Eaton wants to get involved and after talking to him, get impression he wants to start at square one and back on the analyzer. Help, need another path!!

 

Mine is a 2019 same issues same things done except i have had 3 clutches installed. Also wanting me to put back on the vibration analyzer, I'm looking into a lawyer as all they are doing is running my warranty out. When they did the vibration analyzer was it for a full trip recording or just when they thought they felt the vibration?

 

Where have you been getting the truck looked at?

 

I know it might sound stupid but i used to work on cars for 13 years and we had some vibration problems due to motor/ transmission mounts not being in rest position. I don't know if I'm explaining this correctly, but what used to happen is when the engine/transmission was installed in factory engine mounts had tension and this would cause vibration.
I don't know if its easy but if you can access all the bolts that bolts that bolt engine/transmission to mounts, crack them loose just as much to release tension if any from mounts. You have to do this on all mounts at same time. I had fixed couple cars doing this. This might not be your issue but i don't think you can hurt any thing.

 

Thanks for new idea. Even though bit of a long shot, it still seems plausible. Give it a go when i get home. Doesn't cost me anything and like you said, won't hurt anything. Do u recommend which sequence components should be retightened? Thanks again for your idea.

 

We didn’t do in any sequence and we were only cracking the bolts loose so all engine mounts had no tension. Then we used to re torque the bolts.
the idea behind this was when they assemble the cars in factory they are hanging not standing on wheels so when you put the car on wheels the unibody/frame might move or stretch little causing tension on mounts.