Informative thread thanks, you mentioned knocking the caps off the u joint when working on the differential. It's been my experience that 1 or more of the needle bearings will often lay flat inside the cap if the u joint has more than a couple years of wear especially if it's a warm day causing a vibration whenever under load.
From the sounds of it after it came back from the trans shop..the ujoint caps were the cause all along. Didn't get around to updating this as it was probably back for two weeks then was sold..but to make a long story short, when we grabbed a new Ujoint to replace the caps that fell out, the parts store gave us a mislabeled Ujoint. So while the box was correct, what ended up happening was the actual part was wrong. In turn, not only were we chasing a shake that was caused by that, but it also cooked the transmission mount.
Picking up this ol thread because after rebuilding my rear end with new leafs, I got a rumble/vibration I believe is caused by wrong pinion angle. My trans tail is 3 degrees down and my diff is now 4 degrees nose down.
I was thinking to raise the diff nose a little to get it close to 0 deg, so I ordered these 4 deg pinion shims from summit:
Calvert Racing 4-D Calvert Racing Pinion Shims | Summit Racing
I still have the ISO setup with poly pads.
So M_Body_Coupe, when you said massaging your shims, you opened up the slot to make them fit around the round part of the insulator?
I mean the part of the ISO pad that goes into the axle perch?
I did not think of that when I ordered the shims...
