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  1. #1
    Join Date
    Oct 2015
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    Western Mass
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    Can I use this POSI unit?

    Have a chance to pick up a used GM POSI unit for a good price. Obviously would rebuild it, but its a 8.5" 30-spline and I know we should avoid the GOV-LOK models... so is this one of them? Don't mind extra cost of 30-spline axles. Going in a '72 Nova 8.5" 10-bolt, and if its useable, any limits on gears? I'm wanting 3.42 ring and pinion for a 4-speed BBC.

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    '69 LeMans Blue Coupe, White Interior, Massaged .030" over 454, Super T10 4-Speed,
    Holley 4150, Pertronix Ignition, CompCams Xtreme Energy XS274S, 781 Oval Port Heads


  2. #2
    Join Date
    Apr 2001
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    That doesn't look like a GM LSD. It might be an Auburn, which are not rebuildable. Maybe someone else will know.

    Andrew
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  3. #3
    Join Date
    Jun 2010
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    Deployed
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    There are just some things that you’re just better off buying new. I wouldn’t buy any rearend components used unless I had to....it’s so labor intensive to swap out bad parts.

    Why not one of these?

    https://www.amazon.com/Yukon-Gear-YD...90342602&psc=1
    1970 Camaro/DSE build


    Are you driver enough? Maybe....come on blue!
    https://www.pro-touring.com/threads/...71#post1147371

  4. #4
    Join Date
    Oct 2015
    Location
    Western Mass
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    158
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    Quote Originally Posted by badazz81z28 View Post
    There are just some things that you’re just better off buying new. I wouldn’t buy any rearend components used unless I had to....it’s so labor intensive to swap out bad parts.



    Why not one of these?

    https://www.amazon.com/Yukon-Gear-YD...90342602&psc=1
    Yeah... the seller claimed it was a GM POSI unit and wanted $100 for it bc it wasn't for a 12 bolt. But I was suspicious so I posted the pix. I've been looking at Quick Performance for a package deal (POSI, Bearings, Axles, Ring & Pinion).
    '69 LeMans Blue Coupe, White Interior, Massaged .030" over 454, Super T10 4-Speed,
    Holley 4150, Pertronix Ignition, CompCams Xtreme Energy XS274S, 781 Oval Port Heads


  5. #5
    Join Date
    Jun 2006
    Location
    Katy,TX
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    1,672
    Looks like an Auburn to me. As was said not rebuildable. Eaton or Yukon are better.
    1978 Black Trans Am 455 Edelbrock heads [email protected] through mufflers on pump gas
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    1965 GTO project car
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