Good thought. I installed all new U joints this past fall though. And they still check out.

 

Noise finally caught up to me. Made this original post this past September. Suddenly couldn't get the truck out of reverse - neither while it was idling or with the engine shut off. Messed with it for 5 min or so and finally got it into first gear. Had 20 min to drive home. Headed out and after driving for a few minutes something banged and clunked and there was suddenly a loud chattering and vibrations that I could feel coming up through the shifter. The chattering mostly subsided after a few seconds. Didn't dare shift again. Left it right in fourth gear and drove the rest of the way home without shifting again as it was fortunately a straight shot home. Mild metallic chattering and vibrations as I drove. Other than that it went right along in fourth gear without anymore major problems. I don't know what would have happened if I tried to shift.

Could this possibly be a throw out bearing or pilot bearing failure? Or something internal within the tranny itself?

 

Reviving a very old thread here. Your Youtube video no longer exists but symptoms sound similar to what is happening with my truck. What was the fix?