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Thread: 7.5" diff fluid

  1. #1
    FEP Power Member
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    Default 7.5" diff fluid

    Wondering if the 7.5" differential uses the same fluid as the 8.8? Would the 1986 Turbo coupe need the friction modifier fluid?
    Would royal purple 75w 140 fluid work, ok?
    '86 GT - weekend driver
    '86 Capri 5.0
    '86 Turbo Coupe
    '17 Mustang GT
    '23 BRONCO

  2. #2

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    Quote Originally Posted by ZEN50 View Post
    Wondering if the 7.5" differential uses the same fluid as the 8.8? Would the 1986 Turbo coupe need the friction modifier fluid?
    Would royal purple 75w 140 fluid work, ok?
    Yes to all.

  3. #3
    FEP Super Member bwguardian's Avatar
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    The original Ford spec was 80w-90, then it was changed around 2001 to 75w-140 for the 8.8 axle. You could use the heavier weight if it's traction lock, but may be a bit much for an open differential. Most all gear oil is synthetic nowadays and also already has the friction modifier in them, so make sure if the new oil has it in there as too much friction modifier is not good.
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  4. #4
    FEP Power Member richpet's Avatar
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    What they said is accurate.
    83 5.0 GT. Quicker than it looks! 10:1 (or just over) 306, Motorsport a332 cam, 140A alt, t5 conv, 8.8 w/ 3.27's, Edel rpm, alum rad, very worked e7's, Holley SA carb, etc... SOLD IT!!!!

    Now an 1981 Granada! .040 over 302, Edel E-street heads... Currently building a 347 because, why not?

    "Never underestimate the power of stupid people in large groups"

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