Ok this is getting rather rediculous. From inside it sounds like the clutch is squeeking and rattling, but apparrently it's coming from the rear. I had a friend sit outside while I drove around a parking lot, backed up took off, slow, hard all of the above and he said the noise is from the rear. It's a stock YJ with the Dana 35C rear diff. I recently had to refil the diff because of a leaking pinion seal and I filled it with the proper gear lube. Now it's making a racket that will drive anyone nuts and gets worse as it gets warmer. I'm afraid something will break soon. HELP! What would make noise in the rear while accelerating forward or reverse, cause a vibration at highway speed and sound like (best description) a spindle bearing gone bad in the rear? From inside it sound like it's up front around the bell housing, but I'm going to do a little more troubleshooting when I get the chance. This is driving me crazy trying to pin point.