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Beating a dead horse/Rear axle ID

Discussion in 'The Hokey Ass Message Board' started by THE BRONSON, Sep 14, 2009.

  1. THE BRONSON
    Joined: Jan 14, 2008
    Posts: 338

    THE BRONSON
    Member

    I know this has been posted before but Im having trouble finding info to ID this rear axle that was givin to me. Im thinking of putting it in my 53 210. Any help would be appreciated as far as gear ratio etc. The info on the axle reads as followed:

    GM 10 bolt

    A
    ND

    B23

    P
    K-17
    GM

    22507717
     

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  2. Shifty Shifterton
    Joined: Oct 1, 2006
    Posts: 4,964

    Shifty Shifterton
    Member

    Tiny ten bolt aka 7.5" ring gear, from a G body midsize or a B body fullsize as evidenced by the 4 link ears cast into the housing.

    Between the general weakness of that axle design, and the huge heavy things welded to the tubes that probably warped em.......move on. That's my advice.

    Good luck
     
  3. FlynBrian
    Joined: Oct 5, 2007
    Posts: 761

    FlynBrian
    Member

    Looks like a 7.5" rearend out of a G body car, 78 to 87 Malibu/Regal/Cutlas/Grand Prix/
    Pull the rear cover and count the number of teeth on the pinion gear, and the number of teeth on the ring gear, divide the number of ring gear teeth by the number of pinion teeth, thats your gear ratio. Usually it's stamped on the ring gear, will look like this 10/41 if you find it on the ring gear, divide the lo number into the higher number, that your gear ratio also.
     
  4. squirrel
    Joined: Sep 23, 2004
    Posts: 55,931

    squirrel
    Member

    or hold one axle still, turn the other axle exactly two turns, and count how many times the pinion yoke turns, that's the ratio. for example, if it turns two and a quarter turns it's a 2.29:1, if it turns three and three quarters turns it's a 3.73
     

  5. THE BRONSON
    Joined: Jan 14, 2008
    Posts: 338

    THE BRONSON
    Member

    Thanks alot hambers your help is greatly appreciated.

    cheers
     
  6. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    i have this exact rearend in my truck and just ordered the 3.73 gear ratio for it, any more important info i need to know, such as parts, shims, bearings etc before i open up this can of worms? I know the standard gear ratio is intact in it. im just upgrading, anymore helpful info would be apreciated,thanx.
     
  7. scottybaccus
    Joined: Mar 13, 2006
    Posts: 4,109

    scottybaccus
    Member

    The Richmond Gear install sheet will keep you out of trouble. Get it online if you have other brand gears.

    If I recall, you add maybe .010" shim on one side of the carrier to tighten preload a bit and reuse the same stack on the pinion. Should be almost dead on. These things were freakishly consistent in machining tolerances.
     
  8. LowMOJO
    Joined: Mar 6, 2007
    Posts: 522

    LowMOJO
    Member

    thanx for the info scotty
     
  9. Mike_B
    Joined: May 31, 2007
    Posts: 46

    Mike_B
    Member

    Just FYI, some later versions used a 7.625" ring gear, 28 spline axles / side gears, and one of the pinion bearings was larger vs. the 7.5" version. I think carrier bearings, carrier shims, pinion shaft seal, and cover gasket were the same.

    You can tell exactly what you have by decoding the letters and numbers on the front side of the passenger's side axle tube.

    Also, if your carrier is for 2.73 or 3.08, you will need a "thick" ring gear if going to 3.23, 3.42, or 3.73 gears.
     
  10. Silverback
    Joined: May 19, 2008
    Posts: 4

    Silverback
    Member
    from DC Metro

    the parts from an early 7.5" are interchangeable with a later 7-5/8" version, for example, I have the 3.42's that came in a '97 (7-5/8") in an '83 7.5" rear, and it works fine, you could even swap a later 28 spline axle carrier for an earlier 26 spline...
     
  11. Truckedup
    Joined: Jul 25, 2006
    Posts: 4,661

    Truckedup
    Member

    Somewhere around the mid 1980's GM switched to metric axle studs.Not a big deal but the metric studs have a different knurled diameter I believe and can't be swapped out for US thread studs.G Body axle backing plates have a shitty design brake cylinder reatained by a c clip instead of bolts.Check to see if the brake cylinder wobbles around. Later coil spring Camaros also used that axle,can't say if they are all the same.
    The 10 bolt 8.5 axle looks similar at a glance but has a larger center section with two cast iron tits ,one on each side at the bottom.
     

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