Drivetrain vibration

[ipd]

carrier bearings?

[Triathlete]

Found my issue
Decided to degree the rear u joint on the rear driveshaft. After cleaning it I found metal shards (remains of the bearing retainer) twisted up in there. Even though the joint has no play in it when pulling on it, visual inspection showed otherwise.
Fortunately for me I just happen to have a genuine oem Isuzu u joint in my garage that I had ordered about 10 years ago. Now I just need to swap it out this weekend.

[Triathlete]

Replaced the rear u joint with an isuzu oem joint. All greased up. Smooth as butter...no more binding/vibration. It also fixed another long time problem...the clunking when putting it in gear, so if that is a problem you have it may be early warning of a u joint going bad.