Question on proper axle assembly for 1971 GS

Discussion in 'Got gears?' started by BP714SPEEDGSRAG, Jul 20, 2013.

  1. BP714SPEEDGSRAG

    BP714SPEEDGSRAG Platinum Level Contributor

    I need advice on which rear axle assembly came on the 71 GS. The previous owner of my project car replaced the stock axle with a 1970 Chevelle 10 bolt 8.2", 2.56 because he wanted better gas mileage.:confused: I want a "factory correct axle for my resto. and am finding some conflicting information out there. George Nenadovich indicates that Buick Skylark/GS cars from 1968 to 1970 were 8.25" and in 1971 they started using the 8.5". Hemmings indicates that you can find a 10-bolt 8.5"in 1973 to 1977 Buick Gran Sports and then goes on to contradict that information by saying that 10-bolt 8.5"differentials can be found in 1971-79 Chevy II, Nova, Buick Skylark, and Olds Omega. HELP! Thanks, Bob Phelps
     
    BP714SPEEDGSRAG, Jul 20, 2013
    #1
  2. LARRY70GS

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

    The 71 and 72 Skylark/GS came with the 8.5 10 bolt with bolt in axles.

    http://www.jdrace.com/diff_id/10b85.htm
     
    LARRY70GS, Jul 20, 2013
    #2
  3. BP714SPEEDGSRAG

    BP714SPEEDGSRAG Platinum Level Contributor

    Thanks Larry, I'll be looking for a 8.5 10 -bolt
     
    BP714SPEEDGSRAG, Jul 20, 2013
    #3
  4. Mark Demko

    Mark Demko Well-Known Member

    Just make sure its the correct 8.5 rear:shock:
     
    Mark Demko, Jul 23, 2013
    #4
  5. BP714SPEEDGSRAG

    BP714SPEEDGSRAG Platinum Level Contributor

    Thanks Mark. Must be a-body. Any thing else to watch for?
     
    BP714SPEEDGSRAG, Jul 29, 2013
    #5
  6. Mark Demko

    Mark Demko Well-Known Member

    Im not a rear axle guru, but I do know the factory '71 A-body GS rear had the cut-outs on both sides of the 10 bolt cover. Just something to look for:cool:
     
    Mark Demko, Jul 30, 2013
    #6

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