Originally Posted by jaybone

ok, same issue here, vibration 72-78 mph, with 161K figued u joints for sure. Got under to look, the **** balancer on the rear drive shaft was loose, the rubber was broken and could spin it by hand. Oh, drive line shop says they dont make them like that anymore, so they build me a new drive shaft, and balance it for 79.00 Amazing, for 80 bucks. But the vibration is still there. all u joints finally have been replaced, (that front knucke is a chore) still have same issue, now its inside the Transfer case. Drive till it vibrates, place hand on t case shifter and yep here it comes and then hit 85 and it goes away, smooth as can be. I dig deeper and find slop in the rear t case housing where the yoke comes out, I am thinking its like a tail saft bushing gone bad but no one can tell me for sure, dealer says there is no bushing, driveline.com parts breakdown, shows some type of needle bearing.. any help? looks like remove tail cone from t case and then fix what? I read you can get a tailcone for a 271 with installed bushing and seal for 90.00 . Where? this is driving me nutz, so for now....it's cruise control 70 mph max. really suck when you running late for work...