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C3 differential additive

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  • Jeffrey S.
    Extremely Frequent Poster
    • May 31, 1988
    • 1882

    C3 differential additive

    What is the best differential additive to use to quiet sticking positraction clutch pack(?) on a '72? This car has not been driven regularly in a very long time and now it grabs on turns and I want to add some additive. A long time ago someone posted on this board that Ford had the best additive but that was years ago. Thanks for your help.
    Jeff
  • Patrick H.
    Beyond Control Poster
    • December 1, 1989
    • 11643

    #2
    Re: C3 differential additive

    Jeff,

    I'd use 2 bottles of the GM posi additive. I've never heard of anything better.

    Patrick
    Vice-Chairman (West), Michigan Chapter NCRS
    71 "deer modified" coupe
    72 5-Star Bowtie / Duntov coupe. https://www.flickr.com/photos/124695...57649252735124
    2008 coupe
    Available stickers: Engine suffix code, exhaust tips & mufflers, shocks, AIR diverter valve broadcast code.

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    • Jeffrey S.
      Extremely Frequent Poster
      • May 31, 1988
      • 1882

      #3
      Re: C3 differential additive

      Patrick:
      Thanks for the quick reponse. I will use the GM lub. I sent you an off line email.
      Jeff

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