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Preferred Gear Oil for Front & Rear Differential

Discussion in 'Ford Raptor Engine Discussion and Performance Mods' started by Ruger, Sep 11, 2019.

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  1. Ruger

    Ruger FRF Addict

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    Given Royal Purple's reputation and easy availability of their products, I'm seriously considering using their Max Gear product for a quickly upcoming service of my front and rear differentials. Is anyone using Royal Purple Max Gear? I note that Max Gear includes a limited slip friction modifier which I am told is not required on my 2011 GEN1, but the company says the product is for open, limited slip, and locking differentials.

    http://www.royalpurple.com/product/max_gear/
     
    Last edited: Sep 11, 2019
  2. Ruger

    Ruger FRF Addict

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    In the past I have used Amsoil 80w-90 in the front differential and Amsoil 75w-140 in the rear. Royal Purple has 75w-90, not 80w-90. They have 75w-140, though.

    I am concerned about the 75w-90 vs. 80w-90 difference, and also about the friction modifier.

    Can anyone advise me, please?
     
    Last edited: Sep 11, 2019
  3. MTF

    MTF FRF Addict

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    I put the official Ford Chart in my post refer to that for adding modifier.
    I put Mobil 1 in my rear and I'm pleased with it, especially after frying the whole rear years ago.

    https://www.fordraptorforum.com/posts/871674/
     

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