8.5 posi with 308 GM gears

Discussion in 'Got gears?' started by Mart, Oct 5, 2020.

  1. Mart

    Mart Gold level member

    Whats this original posi carrier with 308 GM ring & pinion worth? Used, out of my 71. Was running fine when swapped out for an Eaton Tru-Trac 410.
    I think it needs to go....

    Attached Files:

  2. 71gs3504sp

    71gs3504sp Well-Known Member

    That is not a factory 71 posi unit.
  3. Mart

    Mart Gold level member

    Pretty sure it is. Build date was late 70. I believe GM was using two different types back then.
  4. BrianTrick

    BrianTrick Brian Trick

    Some of the 8.5’s that came in the Buicks came with a cone style posi unit,much like the 8.2” units. I have NEVER found one in a 71-72 Cutlass/442 8.5”. It would be more desirable if it was a clutch unit,but would be good for a resto or cruiser,especially with those 3:08’s.
  5. Mart

    Mart Gold level member

    Any ballpark idea on its value Brian?
    Mark Demko likes this.
  6. Mark Demko

    Mark Demko Well-Known Member

    Its not worth anything Mart, send it to me and I'll dispose of it properly:p:p:p:p:p

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