Gear oil change

Discussion in '1997 - 2003 Ford F150 Truck Forum' started by whomrig, May 29, 2016.

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  1. whomrig TOTM Winner Founding Member Southwest Chapter

    Well, I changed the rear diff gear lube with 75w-140 synthetic and added 4oz friction modifier as per Ford.
    When I do the front diff, that calls for 75w-90 non-synthetic. Question is can I use 75w-90 synthetic or is there any difference in using either?
    The t-case (BW4406) calls for mercon atf, is there any difference in using mercon v atf?
     
    whomrig, May 29, 2016
    #1
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  2. FTZ HAIC Staff Member Oregon Chapter Founding Member

    I have full synthetic in both diffs on my F150, and synthetic Mercon V in the transfer case. Never a problem. I believe the newer trucks come with full synthetic now anyway. Its pretty much interchangeable.
     
    FTZ HAIC, May 29, 2016
    #2
    vmechanics and dustybumpers like this.

  3. whomrig TOTM Winner Founding Member Southwest Chapter

    I was thinking that but not sure. thank you for confirming that Ken.
     
    whomrig, May 29, 2016
    #3

  4. dustybumpers Article Contributor Founding Member

    I'm late to the party, but would have repeated what Ken said anyway
     
    dustybumpers, May 30, 2016
    #4
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