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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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    973
    My guess is that it was improperly filled when the gears were changed. Especially if there weren't signs of it leaking...
    ---
    Jim

    1990 Twilight Blue Mustang GT Convertible

    GT40 Tubular upper and lower intake, GT40 heads, Trickflow Stage One cam,
    BBK 70mm Throttle Body, 24lb Injectors, Silver Fox Transmission AOD SPT-1 Valve Body,
    Headers, O/R H pipe, Flowmasters.
    Dyno July 2016 - 253 RWHP / 293 RWTQ

    Also in the stable:
    2013 Cayenne Red Nissan Altima SL 3.5
    Sold (2015): Black 10th Anniversary Cobra #353

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