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01 XJ with Xler 8.25 rear diff., need friction modifier?


 
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Phi Eta Mu
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Joined: 04 Apr 2007
Location: Puerto Rico, USA

PostPosted: Wed Apr 04, 2007 2:10 pm    Post subject: 01 XJ with Xler 8.25 rear diff., need friction modifier? Reply with quote

I have a 2001 XJ Sport and I am about to change it's gear oil. I've heard rear differentials with limited slip need a friction modifier. Does this rear diferential have a limited slip? Does it need a friction modifier? The owner's manual just says to put in the modifier if you have a limited slip model, but does not tell you which one or how to ID if you have one.The Haynes book doesn't tell you either. I would appreciate any information on the subject
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ThePhantum
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Joined: 23 Jan 2004
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PostPosted: Wed Apr 04, 2007 6:28 pm    Post subject: Reply with quote

There should be a tag on the axle or on the diff cover that tells you the gear ratio and whether or not it has a limited slip. If not, there's a few ways you can tell. The easiest is - with the rear tires off the ground turn one wheel. If the other wheel spins in the opposite direction then it has a LS. If the other wheel does nothing then it's open.
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