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Discussion in 'Got gears?' started by dirtrider546, Aug 17, 2009.

  1. dirtrider546

    dirtrider546 Trevor Gardner

    I am looking at purchasing a rear posi unit. However the guy says that it has a 10 bolt cover with 12 bolts holding the ring gear on, and measures 8.5'' and has 28 spline axles. What in the world is it? And is it what I need for the 8.5'' 72 lark.
    thanks
    trevor
     
    dirtrider546, Aug 17, 2009
    #1
  2. LARRY70GS

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

    What's wrong with the 8.5 rear in your 72 Lark?
     
    LARRY70GS, Aug 17, 2009
    #2
  3. dirtrider546

    dirtrider546 Trevor Gardner

    its a peg legger
     
    dirtrider546, Aug 17, 2009
    #3
  4. dreeesh

    dreeesh Well-Known Member

    some oldsmobile rears were like this,they called them phantom 12 bolts.
     
    dreeesh, Aug 17, 2009
    #4
  5. LARRY70GS

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


    So just buy the posi and gears, and have them installed. The 8.5 is a good strong rear with bolt in axles.
     
    LARRY70GS, Aug 18, 2009
    #5
  6. dirtrider546

    dirtrider546 Trevor Gardner

    thats the plan. Thanks larry.
    P.S it turns out it was a c clip carrier anyway and i believe ours are bolt in axles.
    trevor
     
    dirtrider546, Aug 18, 2009
    #6
  7. monzaz

    monzaz Jim

    Post some pictures of the rear diff under your car... i THINK LARRY'S IDEA WILL SUITE YOU BETTER and save you heads aches in the long run. 71 72 8.5 rears will do the job for your csr street or strip. Jim

    I can even help guide you through set up if you like...All you need is time and patients. Dial indicator will help too. :) Jim
     
    monzaz, Aug 18, 2009
    #7

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