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Differential fluid change - do I need friction modifier?

Discussion in 'Ford Raptor Problems and Questions Forum' started by Madcowranch, Feb 5, 2014.

  1. pastorwug

    pastorwug FRF Supporting Member Supporting Member

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  2. HotLap

    HotLap Full Access Member

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    What? Hey MTF neither of your links are the Ford Performance Diff cover I installed on my 2018 Raptor. And per FP the upper fill hole is to be used only if you have lifted your truck as the rear diff is now at an angle (driveshaft tilts upwards) so to get the right amount of fluid you use the upper hole. If the truck is NOT lifted, you will have too much fluid if you use the upper fill hole. Perhaps I'm misunderstanding Pastorwug's question??

    Good luck...
     
  3. MTF

    MTF FRF Addict

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    Ummm... I was just showing what the top hole is for.

    Lifting the truck doesn't change the angle the of the rear end, only the driveshaft.
    You can change the angle of the rear end if the driveshaft angle is too great.
    Then you would add a wedge shim to angle the rear upwards to minimize u-joint binding.
     

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