posi unit or limited slip????

Discussion in 'Got gears?' started by Rob72GS, Apr 8, 2020.

  1. Rob72GS

    Rob72GS Well-Known Member

    is there any other year of posi units or limited slip that will fit a 10 bolt rear end, for a 1972 buick gs?
  2. LARRY70GS

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

    69GS430/TKX likes this.
  3. monzaz

    monzaz Jim

    There are TONS of Limited slip Units for the 8.5.
    Posi term is a NICKNAME Your calling out the same thing in your statement. Posi is limited slip and vise versa.
    Oldsmobile is anti spin
    Pontiac calls thiers safty track
    AMC twin grip
    Ford track lock
    Mopar Sure grip etc....
    So back to the 8.5
    You have Eaton (clutches), Auburn (cones), True Trac (worm Gears), Yukon Dura grip (eaton style)
    Lockers mechanical Power trax, Detroit Locker, Grizzly locker They are more aggressive in lock-up and can cause noise in turns to release axle torsion twist .

    If you have bolt in axles you can use FULL SPOOL for Maximum traction to both wheel and normall drag race or dirt track racing.
    There is also a super low cost mini spool designed for dirt track low buck boys and girls...
    Finally you have last hope Lincoln locker...WELD the spiders in a open diff. ...LOL :D Not recommend here.

    JD Race
  4. gstewart

    gstewart Well-Known Member

    Thin the term "posi" was a Chevy term and became a generic name like IBM cards.
  5. jalopi42

    jalopi42 Don't Wait

    So what is a peg leg traction rear end called
  6. Bens99gtp

    Bens99gtp Well-Known Member

    Junk. Lol
    Lucy Fair likes this.
  7. Bigpig455

    Bigpig455 Fastest of the slow....

    So to answer your question, yes.

    The 8.5 found in your car was manufactured through 1996, maybe longer. If you want to go junkyard crawling to find a new(used) differential, you'll want to stick with units probably 1989 and below, because I believe 1990 and up units were 30 spline, and wont fit your 28 spline axles. These units can be found on ebay for reasonable prices too every once in a while. Be mindful of carrier break part numbers if you want to use your original ring and pinion. You ight also want to consider a bran new unit - Monzas who has responded earlier or Everyday Performance can probably provide a new Dura Grip style unit for very reasonable money too....
  8. Gary Bohannon

    Gary Bohannon Well-Known Member

    Trutrac has no clutches to wear out, no ratchet to jerk and pop, and eliminates the weak spider gears. Smooth and very strong.
  9. monzaz

    monzaz Jim

    Sorry EVERYTHING WEARS....lol. The worm gears DO wear. And the hole wear.
    That is like saying the ring and pinion do not wear...
  10. jalopi42

    jalopi42 Don't Wait

    you mean open junk lmao
  11. LARRY70GS

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

    The one wheel peel, and a futile attempt at traction in your Buick:D

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