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Thread: 8.8" differential oil loss

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  1. #1
    Junior Member
    Join Date
    Mar 2015
    Raymond, NH

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

    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:
    2007 Silver Mercedes C280 4Matic
    Sold (2015): Black 10th Anniversary Cobra #353

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