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remove the rear cover all the bolts except the top 1 just loosen that 1. Put a bucket under the rear diff and open the diff cover and drain out the fluid. clean and reseal the diff. remove the plug on the front of the diff and fill with the correct diff fluid until it is filled up to the hole and replace the plug, clean up and check for leaks. No leake = job is complete.
if the diff oils is in need of a change then it would be wise to change the oils
if the additive is an approved GM additive then it will not hurt to add it
just make sure that the diff's are not limited slip diffs as they require a special oil and then the additive may not be suitable for the oils
4wd vehicles in the main do not have 3rd diff in the transfer case (unlike all wheel drive vehicles) to allow uneven torque between front and read diffs to dissipate
that means that if you are driving on hard surface ( sealed roads ) there becomes what is referred to as a torque wind up in the drive train .This places all gears ,chains under extreme pressure and prevents gear changing ( shifting out of gear)
To overcome this problem, only select 4wd when driving in snow ,rain, mud, gravel or any surface that allows the wheels to slip and so even out the torque wind up.
If you had to replace the front diff that may have been the reason as front diffs are predominently weaker than rear diffs because of the way the teeth act on each other and the torque wind up will break the weakest part
have someone inspect the rear diff. ive seen diffs changed to diffrent ones and not change the tag. your problem might be in the back. hope this helps good luck
You don't have to remove the whole diff to change the seals, but you will have to seperate it where the shaft meets the carrier housing. There is a clip holding the passenger axle shaft in place that you have to remove to change the seal. The drivers side axle stub can be removed with a little force as there is a spring clip holding that side in.
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