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Thread: 8.8" differential oil loss

  1. #1
    Junior Member
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    Mar 2015
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    Raymond, NH
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    8.8" differential oil loss

    I bought my 2005 GT used last summer with 15K miles; now at 19.5K. In 2005 the limited slip gears were replaced with 4.10. This weekend, my rear axle seemed to be noisier that I was accustomed to, and as I had planned to do a drain & refill anyway (preventative maintenance) I got ambitious and did it.
    • Capacity is supposed to be 2qts 75-140 synthetic + 4oz "Additive Friction Modifier.")
    • The actual drain was maybe slightly more than a quart!

    Inspection found no visible signs of leakage or excessive venting. The magnetic fill plug had about a 3/32" of micro-debris (no particles or filings). The cover was sealed with gray RTV only and I reinstalled it with the recommended gasket. My actual refill capacity was the 4oz friction additive and 2-1/4qt. Result: rear axle noise was totally eliminated.

    Question: what experience are others having with 8.8" axle / differential oil consumption / loss? (Rate of loss? Cause? Corrections?)

  2. #2
    Administrator SVT10th's Avatar
    Join Date
    Sep 2011
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    976
    My guess is that it was improperly filled when the gears were changed. Especially if there weren't signs of it leaking...
    ---
    Jim

    2010 Mercedes E550
    2000 Mazda Miata Special Edition



    Sold: 2001 10th Anniversary Cobra #353
    1990 Mustang GT Convertible
    2002 Mustang GT

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