Question about 1998 Jeep Grand Cherokee

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OVERHEATED DIFFERENTIAL DUE TO LACK OF OIL

I AM TRYING TO LOOSEN THE FILLER PLUG ON ON MY DIFF BECAUSE IT OVERHEATED THE OTHER DAY AND I SUSPECT THAT IT HAS VERY LITTLE OIL.

THE DIFF OVERHEATED THAT MUCH THAT IT WAS LITERALLY SMOKING AND WOULD HAVE SEIZED IF DRIVEN ANY FURTHER.

THE STEERING WAS BECAME VERY DIFFICULT AND A STRONG SMELL OF BURNING OIL.

ANYWAY, CAN'T SEEM TO FIND A DRAIN PLUG WHICH IF CORRECT IT DOESN'T HAVE ONE AND TO DRAIN THE DIFF I WOULD NEED TO LOOSEN AND TAKE OFF THE DIFF COVER.

I AN SEE A PLUG HALF WAY UP THE DIFF COVER WHICH I TAKE IT IS THE FILLER PLUG, BUT, IT IS SEIZED.

THE HEAD OF THE PLUG IS SQUARE AND I CAN ONLY ASSUME THAT THE END OF An unsocketed SOCKET WRENCH IF THE TOOL FOR REMOVING THE PLUG.

HOWEVER, THE DAMN PLUG WILL NOT UNTIGHTEN...BUGGER!!!

WHAT CAN I DO GUYS?

IS THERE A KNACK TO LOOSENING THESE PLUGS?

I KNOW I MAY HAVE COMPLETELY KNACKERED MY DIFF ALLOWING IT TO OVERHEAT BUT ALL I CAN DO IS TO TOP IT UP WITH DIFF OIL AND SEE?!

ANY ADVICE APPRECIATED

THANKS

PAUL

Posted by on

  • diezeltruck May 10, 2009

    Guy's you'll laugh when you hear this.



    Guess what overhaeted my diff?



    Well, try running a 225 tyre alongside the remaining 205 tyres which were on the vehicle.



    No wonder the steering kept jumping



    I'd wound up the diff after accidently replacing my flat front nearside tyre for a spare that was a 225 instead of a 205.



    Believe it or not but i'd driven about 50miles at speeds in excess of 70mph before realising that the diff was ready to explode.



    Anyway, a mechanic in Todmorden removed the front prop shaft from front diff and made the vehicle 2 wheel drive which was the cheaper option otherwise to renovate the front diff would have cost me in excess of £600.



    Now I own a 2 wheel drive Grand Cherokee.



    Its quiter, quicker, and more fuel efficient!!!



    But even so, won't make that mistake again!!!!!!



    Paul

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Square hole plug is the fill hole. use a breaker bar to gain leverage to loosen. fill up to thetop of hole. use the end of a zip tie to check how full it is.

Posted on May 10, 2009

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Yes you do use the end of a ratchet or breaker bar,and they are generally pretty tight anyway,use a peice of pipe to extend you ratchet or breaker bar,standard thread so it will loosen to the left,once you're all set up trying giving it a few quick pops rather to loosen rather than constant torque.Fill with gear lube to the bottom of the filler hole.But you should keep your eyes open for what may have caused the oil level to drop to begin with.

Posted on Apr 12, 2009

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It doesn't have a drain plug. Yes the square plug is the fill plug. You have to remove the cover to drain it. To remove the fill plug try an open end wrench with a pipe over the end of it.

Posted on Apr 12, 2009

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