rear end vibration

[91 chrokee]

91 cherokee no lift. Checked tire balance all are good. Changed fronts to rear no help. Vibrates at rear not throught steering at all. Changed u joints trans mount no help. Checked u bolts all tight.It starts at about 60 and stops at about 65. It feels like the rear end is almost bouncing off the ground. Could my extremely sagging rear leafs be an issue? Driveshaft looks fine no dents or dings. Any help would be greatly Appreciated.

 

[SteelHeadz]

The sagging suspension would not cause a vibration like that. Another thing to check is a bent axle shaft. Did you physically remove the rear drive shaft to inspect the u-joints?, sometimes a bad u-joint won't wobble if it's in a bind.

 

[91 chrokee]

The sagging suspension would not cause a vibration like that. Another thing to check is a bent axle shaft. Did you physically remove the rear drive shaft to inspect the u-joints?, sometimes a bad u-joint won't wobble if it's in a bind.

I did remove the driveshaft and I marked it before I took it out. The u joints moved very little but I figured I would replace them since I had it out. I also just replaced motor 4.0, radiator, ac condenser, water pump, alternator, motor mounts. I also checked all the fluids, diffs, and transfer. Also put in nuetral and climbed under to see if I could find anything loose in the rear end. Everything seems tight and no noises. Not sure how to check a bent axle shaft? Also jacked up rear to check if wheels had any movement seemed tight. Thanks for help

 

[carnuck]

Do any sliding in the winter? Axle stands and slowly spin the tires

 

[Alaskan89XJ]

Had some balanced used tires, but at speed I'd get 'wheel-hop', which comes from a tire damaged in the main foot print belts, i.e, from either hitting a rock, curb, etc., or from sitting under a vehicle's weight, rotting away, for an extended time. Happened to a used vehicle I bought. 'Dunno which was the case, but it was what caused the 'wheel-hop' at certain higher speeds, i.e., a bulge would extend outwards from centrifical force. Then, at either side of that certain mph threshold, it would go away. Hmmm...

 

[Glamissand1]

tire stop leak can make this happen. cheak bearings and seals. roll diff with tires rolling same way in the air to check ring and pinion, and in reverse of each other to check spiders unless your locked. a broken or dirty drum brake can be a hidden source of uneven weight. good luck!