THumping noise in Rear End of Jeep Grand Cherokee 1996
Vehical needed rear oil seals replaced. while doing this we also replaced the wheel bearings. after we drove it when we would reach 40 mph and above we could hear a distinct thumping. Since we have replaced all the bearings in the rear end and have had all of the gears checked by a pro. and the u-joints are good. any ideas
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Check the rear universal joint on the drive shaft for wear or evidence of rust. Take hold of the driveshaft and check for excessive play. Check for excessive play in the rear axles and look for leaks from the seals while you have the rear tire off. Hopefully the noise is not related to an internal issue with the rear differential.
There is some work involve in replacing rear main seal, seal sit in the rear of the engine block, the transmission will have to be remove, and the fly wheel to get to the rear main seal.If you have never removed a engine or transmission, it might be best to pay and have some one do it for you.
You should be ok replacing the outer seal but check for bearing play or fautly outer wheel bearing before you disassemble. If to much lateral movement in axle shaft it will take out your new seal rather quickley.
Since you aready paid $400, go back to ;the shop and get your $'S worth!! Unless someone can prove that the axle bgs were bad, you shoulld ask why pinion & side gears were not diagonsed!!! (dosen't anyone test drive stuff after they "fix" something anymore??? Dosen't anyone give a damn??? If you can't get anywhere with this, find a junkyard unit and install it yourself. It isn't that hard. Just be sure that new lone has the same mount points and gear ratio matches ratio lof front axle.(count gear teeth if you must)
check the differential fluid in the rear differential. if the fluid is low, add fluid and see if the noise is still there, if the fluid level is ok see if the fluid appears metallic, if it is metallic looking or excessively thick it would be a good idea to have the bearings checked out. i am in the process of rebuilding a front differential on a 98 jeep grand cherokee for the same problem. the bearings inside the differential on the carrier and pinion gear were worn out causing a humming noise. if the wear is excessive the gears might also need to be replaced
Go to Jeep and buy a bearings, seals, and collar. The bearing is held in place on the axle by a keeper collar. This must be cut off to get the old bearing and seal off. Use a wizz wheel to cut it and then whack it with a chisle
To get the axle out. Remove rear diff cover, and wheel and start taking apart. It's not a terrible job, but if you aren't very mechanically inclined, take it to a shop. Make sure you use the correct fluid in the differential.