GT350 Gear Oil Changeout

Discussion in 'Drivetrain, Exhaust and Electrical' started by 11GT50, May 2, 2018.

  1. 11GT50

    11GT50 TMO Intermediate

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    I saw in another thread that a handful of people were recommending a switch to 75w-140 in the rear end. I'm curious if many are still supporting this idea for moderate track use or if it's best to stick with the factory 75w-85?
     
  2. racer47

    racer47 All I got left is fast

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    Since no one else replied yet, I'll throw out my 2 cents.

    I'm not a gt350 expert but I think it has a torsen type rear diff. If so and you go thicker, it makes the diff slightly tighter, meaning slightly more torque to inside tire, slightly more like a spool. But this is not a big change. It can also make the rear end run slightly hotter, but again not by much.

    FWIW I run 85w140 non syn gear oil in my Eaton trutrac (torsen style diff).

    But, if I were you, I'd just run what Ford says to run. There isn't really much if anything to gain.
     
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  3. 11GT50

    11GT50 TMO Intermediate

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    Thank you for your input.
     

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