The rear differential leak on my 2002 Jeep Grand Cherokee

Rear cover gasket is easy. Unbolt, drain, clean and replace gasket; fill with proper gear oil. Pinion seal on the front of the differential, different matter. If its the pinion seal leaking, take it to a shop with experienced techs.

front & rear seal oil pan ,crank seal,vavle covers,oil pan gasket..

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.

Bearing stays in the housing but check it for wear...often the seal leaks because the bearing has too much play. Yes pin in diff needs to come out.

You can go to autozone.com and register for full free online repair manual that has the diagrams you need and everything else you could want.

rear axle at leave parking brake wet how to replace seal

Most of the time, a whining noise from the differential is an indication of a worn rear end or low on fluid. Low on fluid would also indicate a worn and leaking gaskets seals. Good luck and keep me posted, be glad to answer any more questions you may have. 

The only place you did not mention is the pinion seal (at the yoke where the driveshaft connects) Any leak from a differential should be fairly obvious...clean everything off well and drive it, You should see seepage somewhere. Any grease on the wheels or new fluid where you cleaned will tell you where to look. If it is at the pinion seal, If you haven't done this before, don't...you can disturb the adjustment inside the gear case and damage the gears.

You will need to remove the differential rear cover,drain fluid, remove wheel, brake drum, (rotor) . Unbolt center diff. pin, carefully remove (don't loose shims) push axle in remove lock keeper, then slide out axle, replace seal, put some grease on it, slide axle in reverse all to install.

1. Remove or disconnect the following:
   
   Rear wheel Brake caliper and rotor, if equipped Brake drum, if equipped Axle retainer nuts Axle shaft, seal and bearing assembly
   
2. Split the bearing retainer with a chisel and remove the retainer ring.
3. Press the bearing off the axle shaft.
4. Remove the axle seal and retaining plate.

Fig. Rear axle seal and bearing components-2002-05 exc. 2005 Grand Cherokee Hope this helps, please dont forget to rate my solution.



Lefty64