OK, so today I took my jeep for a drive and my U-joints I know are already shot and gone and I just haven't been able to replace them yet. The problem is that at freeway speed, the jeep has an unusual vibration, and its getting worse. After the drive there is a puddle of oil underneath my rear diff. Can any one tell me what happened or how to fix? Any help is appreciated.

Sounds like you have torn up the pinion seal in the rear diff from the vibration of the bad u-joints. Chances are you might have took out the pinion bearing also.

The vibration will also loosen the nut on the pinion yoke. Crawl under it and see if it is loose. At the minimum will will have to tear it apart and put a pinion seal in it.

ok thanks, i can move the rear drive shaft around more so than the front one. thanks for the help.

i would also replace every thing you can gasket and bearing while you have it apart so you dont have to got back and fix something else later

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Cyberwaste

ya i was planning on doing a whole rebuild.

Im gettinf brand new Dana 44 axles front and back with 4.10 gears. Say goodbye to 5 grand.

I just bought a 8.8 Rear end out of a 1998 Mercury Mountaineer. Much Much stronger than the stock rear end. I'm happy.

nice.. how much of a lift do you have?

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2003 Ford Mustang SVT Cobra
4.6L DOHC V8 - 6 speed manual
520rwhp - 525rwtq at 16psi on stock blower
2002 Ford Mustang GT
4.6L V8 - 5 speed manual

2in. body and 4in suspension

I would replace the fuel filter first. It's a cheap and easy fix for the most part, and with the age of the vehicle, it's is probably due for it anyway.
May this HELP you...........

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Tiffin Motorhomes