BRXJ

I have a 99 Cherokee 4.0 5 speed with 140,000 miles on it. There is a rumble noise in the rear around 37 mph, then at 59, and 71mph. I feel no vibration, but it is a bassy harmonic rumble. It does not matter if I am accelerating, backing off the throttle, what gear, or even if I am in neutral. I would normally think its the tires, but I feel zero vibration. Has anyone ran into this? Would you guess tires, wheel bearing, or rear diff problems. Rear diff fluid is full with no leaks or whines. Thanks.

Screwd up 6

I installed my 4.5 lift yesterday and noticed a simlar sound, but its only at higher speeds when I let off the gas and when i press it. Mine sounds like a grumbling noise. Its kinda deep, but sounds like a 1-2 sec deep grumble and I know for sure mine is coming from the back end.

X1994J

At 140K it could def. be a carrier or pinion bearing in the rear diff.

93gc40

Also, U-Joints and axle bearings. Could also be Tires.

BRXJ

I jacked it up and wiggled the u joint when I got it and there is no play in the rear end or ujoints but there is play somewhere inside the transfer case. The jeep is all stock btw.

tacoleman93

Last month i noticed a sound similar to what you described coming from my rear end particularily the passenger side. come to find out at my next tire rotation i had two jammed wheel bearings. Big-O tires replaced them for free which amazed me. good luck

lambo

Check to make sure exhaust is not rubbing anything.