2000 Jeep Grand Cherokee • 4.0L 6 cylinder 4WD Automatic • 142,000 miles

The vehicle im working on is slow to accelorate and feels like the trans is slipping in 2wd when I put it in 4wd the front wheels tear up the dirt like normal but not sure what the rears are doing after this experience is it possible that the rear diff is going bad? Or is it the trans only could this problem be cause bc the cooling fan doesnt exactly work and needs replaced?
March 26, 2014.

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