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Technical GM 10 bolt axle ID

Discussion in 'The Hokey Ass Message Board' started by 41superc, Apr 5, 2019.

  1. 41superc
    Joined: Mar 28, 2007
    Posts: 6

    41superc
    Member
    from Cary, NC

    Hi everyone. Some time ago I bought a GM 10 bolt posi rear axle for my '41 Buick Super coupe. The axle had no brakes. Now that I'm assembling the car I don't know what year model brake kit to buy.. It seems some of the shoe hardware changed every two or three years, espec. the parking brake hardware. Can anyone identify the year model of this rear end? here are the numbers:.
    on front of right axle tube: "2TX P161D. On the hogshead casting, front, left: 526196-10, and "25"
    On the hogshead casting, right front, "156. These are all the numbers. It has a round diff. cover with half moon indentations at the 3 and 9 o'clock positions. Thanks for any help. I've search the net for days and can't find any matches.
    --Paul Smith
    Raleigh, N.C. fat37ply@nc.rr.com
     
  2. drptop70ss
    Joined: May 31, 2010
    Posts: 1,118

    drptop70ss
    Member
    from NY

    post a picture of the rear cover, makes it easy to ID.
     
  3. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 7,374

    mgtstumpy
    Member

    upload_2019-4-6_19-59-2.png
    There are four (4) versions of 10-bolt GM rear ends: 7.5/7.625, 8.2, 8.5, and 8.6". If yours matches the picture it's a non 'C' clip 28 spline BOP 8.2" either from a:-
    • Oldsmobile Cutlass 1964-1972;
    • Pontiac Firebird 1967-1972; or
    • Pontiac GTO 1964-1972.
    This a similar 28 spline Chevy 'C' clip' 8.2" 10 bolt.
    [​IMG]
     
  4. mgtstumpy
    Joined: Jul 20, 2006
    Posts: 7,374

    mgtstumpy
    Member

    upload_2019-4-7_13-26-49.png
    'B' - Buick and 'P' -Pontiac https://www.hemmings.com/blog/article/b-o-p-rear-axles/

    10-bolt 8.2-inch B-O-P axle usage:
    • 1964-’66 Olds F-85, Cutlass, 4-4-2;
    • 1964-’72 Tempest/GTO;
    • 1967-’71 Firebird; and
    • 1964-’71 Buick GS/Gran Sport
    You may be fortunate to a rare 'N' (Nodular) housing
    upload_2019-4-7_13-11-14.png
     
    Last edited: Apr 6, 2019
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  5. 41superc
    Joined: Mar 28, 2007
    Posts: 6

    41superc
    Member
    from Cary, NC

     
  6. 41superc
    Joined: Mar 28, 2007
    Posts: 6

    41superc
    Member
    from Cary, NC

    Hey Stumpy. Thanks! Top pic looks like mine, except mine doesn't have that reinforcing web on the bottom from the housing to the axle housing. Mine does have two parallel webs on either side of the front of the hogshead.
    Now I can buy my brake kit. Thanks!
    Paul Smith
     
  7. bchctybob
    Joined: Sep 18, 2011
    Posts: 1,555

    bchctybob
    ALLIANCE MEMBER

    In the interest of keeping similar info in one place I'd like to tack my questions onto Paul's 10 bolt post if I may.
    My roadster has a 10 bolt and I'd like to order some new axles with both Chevy and Olds bolt patterns but I know what will happen when I place that call - they are sure to ask the very question I don't have an answer to. The photos below show the axle, it looks like some mounts have been removed from the top of the casting. The casting # is 383939N, GM8 appears on the other side and ZA 1 30 is stamped on the axle tube, it's 60" wide. I think it's a Chevy 8.2 C-clip rear end but I'm not sure.
    Any help is appreciated.
    IMG_1893.JPG IMG_1894.JPG IMG_1891.JPG
     
  8. squirrel
    Joined: Sep 23, 2004
    Posts: 42,690

    squirrel
    Member

    here's one that's possible....

    1964 Chevelle ZA 3.08:1 ~ found with Powerglide transmission

    if I were working on it, I'd pull the cover and see what's stamped on the ring gear, as far as date, and also see what ratio the rear is by turning things and counting
     
  9. bchctybob
    Joined: Sep 18, 2011
    Posts: 1,555

    bchctybob
    ALLIANCE MEMBER

    Thanks, it sure drove like 3.08s. The year/model is what I was looking for.
    I’m vacillating between new axles for this one and bolt it back in or narrow the Olds 9.3 that I have and making new brackets n stuff. I’m recreating a car from my past, it had an Olds engine, 4spd Hydro and Olds rear end. My Halibrands are single pattern -Olds. I tried to redrill the axles of the 10 bolt using my drill jig but they are hardened.


    Sent from my iPhone using The H.A.M.B. mobile app
     

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