12 bolt in a buick GS

Discussion in 'Stock Appearing' started by Cellguy, Mar 14, 2010.

  1. Cellguy

    Cellguy 86 Somerset Screamer

    Can you use a 12 bolt rear end in a buick GS and still pass tech inspection at any F.A.S.T. or stock appearing event? Thanks
  2. John Brown

    John Brown On permanant vacation !!


    12.00 REAR AXLES
    12.01 The rear axle housing must be of the same manufacturer as the car. OEM appearing aftermarket housings are OK.
    Internal modifications are OK. Any gear ratio allowed. Aftermarket axles are OK.
    Upgrade to posi-unit or spool is OK.

    I believe they will accept GM as the manufacturer of both Buick and Chevrolet so the 12 bolt should be acceptable.... but that's just my opinion. I'd ask on the F.A.S.T. site just to be 100% sure.
    Bills72stage1 likes this.

    RACEBUICKS Midwest Buick Mafia

    12 bolt is fine I run one in the wifes GS
  4. Greg Gessler

    Greg Gessler GS Stage1

  5. Cellguy

    Cellguy 86 Somerset Screamer

    I read that too.. I think it would be considered but I had to ask... Thanks for the info and link..

    PM sent I think you may have something for sale :grin:

    Yes, I wanted to try F.A.S.T. but will need your help with some stock appearing info and equipment.:Brow:

    Thanks again guys...
  6. low buck Jim

    low buck Jim Well-Known Member

    Many Canadian built GSs came with the Chevy style 12 bolt factory. Mine did.
    matt68gs400 likes this.
  7. scubasteve455

    scubasteve455 Well-Known Member

    What ratio are you guys running in the 12 bolts

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