8.5 Limited Slip

Discussion in 'Got gears?' started by Rob72GS, Sep 28, 2020.

  1. Rob72GS

    Rob72GS Well-Known Member

    1972 GS
    what years will the 8.5 limited slip work from 1970-?????? I know it needs to be 28 spline, correct?
  2. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Any 8.5. The posi carriers and gears fit any 8.5 rear as long as the axle spline count is compatible. 1970 was the 8.2, different rear. The 1971 and 72 Buick Olds 8.5 rear used 28 spline axles and were bolt in axles. When I built the 71 8.5 rear for my car, I went with a 30 spline Eaton posi and 30 spline Moser axles. The 8.5 was used all the way into the 90's, but most of the later rears are c clip rears (like the GN's). Still the 8.5 parts will all fit unless the axle splines are different.
  3. Rob72GS

    Rob72GS Well-Known Member

    so a limited slip from a s-10 will work as long as its a 28 spline?
    btw, just had my blocks sonic tested they passed.....lol
    thanks for your help on that
  4. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

  5. TexasT

    TexasT Texas, where are you from

    Make sure this posi unit has clutches and isn't the gov lock kind that explodes when spinning it too fast.

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