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Thread: 80w-90 Alternatives ??

  1. #1
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    80w-90 Alternatives ??

    Rebuilding the differential clutch packs on my car, Ive noticed 80w-90 is impossible to come by in synthetic..

    Can the diff be ran with a synthetic 75w-90 or 75w-140 ?
    Last edited by bryce_am; 07-12-2019 at 02:03 PM. Reason: Resolved
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  2. #2
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    Ford changed their recommendations to 75-140 a decade ago.


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  3. #3
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    justbob - [i]Ford changed their recommendations to 75-140 a decade ago.
    Circa 2007.

    Motorcraft SAE 75W-140 Synthetic Rear Axle Lubricant (Ford part name) ZC-32-A / WSB-M8B16-A2 (Ford part number / specification)
    .

  4. #4
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    Quote Originally Posted by justbob View Post
    Ford changed their recommendations to 75-140 a decade ago.


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    Ya! What Bob said. All you want is 75w-140 (unless you like re-doing bearings!

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