Need help chasing a vibration

Hello,

On my 2004 taco, when I let foot off the gas pedal or coasting downhill, there’s a sudden vibration. So far changed center bearing on driveline, checked the rear differential the pattern looks good and backlash is good.

Didn’t change the u joints but don’t see any play in them.

Any suggestions will help.

 

How are your leaf springs and spring and shackle bushings?

Maybe a transmission mount (or a little less likely, motor mounts)?

How are the flange bearings?

Could also be a u joint. They are pretty easy to change. When you say there is no play- did you check that with the drive shaft disconnected from the truck?

 

- Leaf springs less them 3k on them.
- Transmission and motor mounts look good.
- Pulled the rear differential out to confirm that the bite pattern and back lash is good.
- U joints no play, driveline unbolted from both rear differential and t case, center bearing already changed. But thinking to change them to get that out of the possibilities since they are reasonably priced.

 

Crack in UJoint perhaps

 

Yep throwing the rear differential in right now. And change the joints out to see if it gets rid of the noise