sorry to bother guys, but my 98 xj is making a, when in reverse it sounds loke a rubbing or grinding maybe not real sure how to discribe it, here recently it is doing it when i turn going foward, nothing is rubbing anywhere, could it be the rear axle, i need some input please, i drive it everyday and it has gotten worse over time.

 

1) check the brakes
2) pull the diff cover and have a peak inside

 

i did pull diff all looked good, i will check the brakes tomarow thanks

 

brakes are good no idea what it could be, seems as tho when i first get going don't notice it at all but as the jeep hotter the noise does to, and it comming from the rear

 

my 1991 does that also, mostly when I turn left or go slowly up the driveway, sort of a grinding moneing sound...I thought it was the leafsprings straining, but maybe not. I am also looking for an answer as to what it could be . maybe the ring and pinion ? spider gears ? I have no idea.

 

I would look really close at your spider gears. Also i have seen just an additional bottle of friction modifier fix similar problem.. hope this helps.. Austin

 

I had something similar on a older doge fleet truck, sounded kinda like road nosie comming off a tire, but you could tell its from the rear end. Took it to a shop and they told me the rear end is out, and that the dif was all but glowing red. I didn't look at it first hand this was many years ago and I was a fleet truck so I didn't care what was wrong, but if you know its a whine comming from the rear end it doesnt sound good. Have you checked u-joint right a dif? Maybe axel bearing?