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Stock 59 chevy rear posi swap question ???????????

Discussion in 'The Hokey Ass Message Board' started by Cody Walls, Jun 26, 2012.

  1. Cody Walls
    Joined: Nov 14, 2008
    Posts: 1,468

    Cody Walls
    Member

    So I've done searched for past hour and I just give up. so heres what i have ,Its a stock rear out of my 59 chevy station wagon . I picked up a posi unit out of i think a 57 rear , witch from what im told the rears are all the same from 55-64 , SO here's what i herd , it would be a simple swap and I would be good to go. so heres the big delema
    go to put the posi in and the rear axel carrier bering are the rong size and everyone i talk to says that all the rear axel carrier bearing for these rears are what the posi unit is, which is 1.627 I.D. and my 59 bearings are 1.782 I.D. Has aney one out there ran into this problem? or even know what im talking about , if so what did you do and aney help would greatly be appreciated.
    The race measures od 3.150 and
    heres a pic of my 59 bearing on the posi unit and the problem .
    [​IMG]


    Thanks
     
  2. Torkwrench
    Joined: Jan 28, 2005
    Posts: 2,475

    Torkwrench
    Member

    Your posi unit may be from an early Chevy II, a 1962 - 1964, or so. My older brother, (hrbhrb here on The HAMB), ran into this problem in about 1971. The carrier bearings on his posi, were smaller than the bearings on his original 57 rear end. The hubs on the posi, where the bearings press on, were smaller, too.
     
  3. Cody Walls
    Joined: Nov 14, 2008
    Posts: 1,468

    Cody Walls
    Member

    thanks for the info , ill have to check into some more , but the thing is that my friend has a 62 posi unit out of an impala and its the same as my posi unit , :confused::( so i guess ill keep on looking
     
  4. hrbhrb
    Joined: Jan 3, 2010
    Posts: 43

    hrbhrb
    Member
    from Polo,IL

    Hi, Just to expand on what younger brother (Torkwrench) said. I had also gotten the idea that everything from 57 to 64 would interchange. I was given this posi and told that it was out of a Chevy II. and would fit my 57. As noted above the bearings are smaller (both id. and od.). In all other respects it appears to be identical to the 57 units. It is stamped CHEV with additional numbers (don't recall what), so the Chevy II theory seems plausible. I hope someone with more knowledge of this subject can clear up the mystery.
    Bob
     

  5. squirrel
    Joined: Sep 23, 2004
    Posts: 47,518

    squirrel
    Member

  6. Cody Walls
    Joined: Nov 14, 2008
    Posts: 1,468

    Cody Walls
    Member

    sorry , you were correct

    thanks squirrel
     
  7. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 6,569

    56sedandelivery
    ALLIANCE MEMBER

    The Chevy II/Nova drop out third members are a light duty unit; even the casting is thinner, as well as having smaller bearings. Jump on over to ChevyTalk.Org, and read the stickies by DZAUTO/Tom Parsons. He's a wealth of knowledge on everything Chevrolet, and these rear ends are one of his specialties. Butch/56sedandelivery.
     
  8. Fast67VelleN2O
    Joined: Mar 6, 2007
    Posts: 494

    Fast67VelleN2O
    Member

    The posi unit that you have is 1962-1964 Chevy II Nova. It will not interchange with the full size 1955-1964 Chevrolet rear ends at all. You need a passenger car unit for sure. If your rear end center section has a 3 series gearset, you'll need a stock Chevrolet GM Arma Steel unit with a casting number of C-30743. Good luck on your search.

    -Matt
     
  9. Cody Walls
    Joined: Nov 14, 2008
    Posts: 1,468

    Cody Walls
    Member

    Thanks everyone who helped me find out what this was , , it sure had me stumped ,
     
  10. Tom is the man to talk to. He knows his stuff
     

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