I just drove 300 miles from Penn State back home to where I live for spring break in my 1998 Jeep Grand Cherokee. When I pulled up the driveway I heard a rattle coming from under my Jeep. It turned out to be a broken clamp for the muffler. However, when I was under there, I noticed gear oil leaking out the rear differential. It was leaking out where the drive shaft goes into the rear differential. What is the problem here and how do I go about fixing this? The Jeep has the Selec-Trac 4WD system. Thanks in advance.

Sounds like you need to have the pinion seal replaced.

Sounds like you need to have the pinion seal replaced.

Oh ok thank you very much. I'll see what I can do.