The rear-end in my 3/4 ton Chev truck recently went out; the pinion gear shaft bearing cage broke apart, thereby letting the sleeve bearings "jam up" the rear-end, and then it would release, VIOLENTLY. After the rear-end was repaired, the shop said the trans was making "some noise". Actually, it's lots of noise in first and reverse; once it up-shifts, it's quiet. I've quit driving the truck until I get the trans swapped out. However, when I swapped in the TH-400 several years ago, from a TH-350, 9 inch extension housing trans, I used a longer slip yoke to make up for the discrepancy in the driveshaft length; I probably should have shortened the slip yoke up by 1/2 to 1 inches. I think the broken rear end beat the trans up, literally jamming the slip yoke into the trans, and that's what is now causing the trans noise. Would a broken silencer ring cause that much noise, or is the rear planetary shot? What's the possibility of the case being damaged? Thanks for any help!