Question about 1998 Jeep Wrangler

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Blow rear differential

I have a 98 wrangler my rear differental was blown. I had it rebuilt with a dealer kit. It has been a month and it is going again. Lucky it's still under warranty but not sure why it would go again. Any suggestions? I have a 3" body lift and larger tires. I'm new to the jeep so I am completely lost when it comes to the lift kits and such.

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  • ppdbdu2 May 30, 2009

    I picked it up about a 3 months ago from a young kid and after going over it it seemed pretty beat on. I've been getting rid of the **** (i.e. hood scoop) and making it into a jeep again. The body lift was already done. Engine and trans are in good shape. I'll attribute the first blown diff to it being beat on without knowing the jeeps history. I have only driven on the street or highway and have not had a chance to beat on it. I knew it did not sound right when I picked it up from the shop after the rebuild I should have stuck with my instincts. The diff failure after rebuild was less than 30 days someone at the shop had made a comment that a problem with the trans maybe causing the failure. Not sure i'm buying that one....Thanks for you help

  • ppdbdu2 May 30, 2009

    That's it. I did hear a whinning but not initially. I have a soft top with soft door and the weather on the east coast has not been to friendly. When I went topless is when I heard whinning. Again thanks for your help. I think the guy who did the rebuild and I are going to have a long talk.

  • Samuel Charles Spriggs May 11, 2010

    My only experience with body lifts is that they rip out u-joints. I guess it could do the same thing to a differential.

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  • Jeep Master
  • 6,982 Answers

If all metal debris was not cleaned from inside housing it will make short work of bearings etc. If unit was not assembled correctly (requires skill, dial indicators and absolute attention to clearances), it will also quickly fail.If not properly filled with fluid same. If you went off-road and beat on it, that does not help either!!! 3" or any lift kit technically voids most warranties....in my opinion, a lift of 3" will not cause diff failure, especially that fast.

Posted on May 30, 2009

  • Richard Scordino May 30, 2009

    Only way a trans can blow a rear is if it were to "neutralize" then suddenly engage...That would snap the diff spider gears. If it was whining after rebuild, likely internals weren't set correctly.

  • Richard Scordino May 30, 2009

    Before having the talk, google setting up differentials...I know this stuff and found pretty good overview of the operation from west coast differentials there...After reading it the tech won't be able to talk over your head and confuse you, and when you see the gearset, you will know exactly what you are seeing!!! (knowledge is power)

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