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Technical Rear End Identification - HELP

Discussion in 'Traditional Hot Rods' started by Andrew641, Apr 1, 2021.

  1. Andrew641
    Joined: Apr 1, 2021
    Posts: 6

    Andrew641

    Hey guys I have a 1963 C10. A sbc 350 with a 700R4 was swapped into which I have rebuilt both and moving on to the rearend but I don't know exactly what it is. I want to say its just a common chevy 10 bolt but I have never seen one with a cover like this. It is also a 6 lug as well. Thanks for the help.
    20210401_011416.jpg 20210401_011422.jpg
     
  2. Mimilan
    Joined: Jun 13, 2019
    Posts: 808

    Mimilan
    Member

    Doe it also have a drop-out diff head on the other side?
    If so , It could be an Eaton HO52 or Eaton HO72
     
  3. Looks like the original one to me..
     
  4. squirrel
    Joined: Sep 23, 2004
    Posts: 47,924

    squirrel
    Member

    they used that rear from 55-63 in trucks. But some of the 63s had the new 12 bolt truck rear.
     

  5. Andrew641
    Joined: Apr 1, 2021
    Posts: 6

    Andrew641

    This seems to be most likely I was trying to see what rearend came in them but I only could find the 12 bolts.
     
  6. Andrew641
    Joined: Apr 1, 2021
    Posts: 6

    Andrew641

    I already checked to see if it could be but it doesn't match up.
     
  7. 1971BB427
    Joined: Mar 6, 2010
    Posts: 6,516

    1971BB427
    Member
    from Oregon

    Not an Eaton, as the Eaton has two bolts close together at 9 and 3 o'clock positions.

    [​IMG]

    It appears to be the old early 10 bolt.
     
  8. Andrew641
    Joined: Apr 1, 2021
    Posts: 6

    Andrew641

    Do you know if anyone sells any rebuild kits and positrac kits for these old 10 bolts? I don't know if its a 7.5", 8", 8.2", or 8.5" without taking it apart.
     
  9. squirrel
    Joined: Sep 23, 2004
    Posts: 47,924

    squirrel
    Member

    this is the gasket for the 1963 C10, available on rockauto, although I rotated the picture 90 degrees so it would match the truck.

    10 bolt truck gasket.jpg

    this is your cover, They match pretty well, eh?

    [​IMG]
     
    olscrounger and 47chevycoupe like this.
  10. 3quarter32
    Joined: Dec 10, 2010
    Posts: 371

    3quarter32
    Member

    Looks like the 2 right and left side bolts are closer together, more close to the center of the axle. Optical illusion?
     
  11. banjeaux bob
    Joined: Aug 31, 2008
    Posts: 6,006

    banjeaux bob
    Member
    from alaska

    HO72 would have 8 lug wheels.
     
    squirrel likes this.
  12. Mimilan
    Joined: Jun 13, 2019
    Posts: 808

    Mimilan
    Member

    This thread has already ID'd the rear end as an Early 10 bolt.

    But an HO 52 and HO 72 doesn't always have 8 Lug rear ends [but they are usually floater rear ends]
    The HO 72 in my friends 58 Chevy 1ton is 5 lug [floater]

    The HO 72 and 52 diff heads are interchangeable [bolt in swap] ,the only difference is early [17] and late [30] axle spline counts.
    Also the Eaton Floater Hubs/Drums/ Brakes are a direct bolt on swap with the later model GM 10.5" 14 bolt rear [so the PCD can be changed easily]
     
    Last edited: Apr 1, 2021
  13. Andrew641
    Joined: Apr 1, 2021
    Posts: 6

    Andrew641

    Looks like thats it. Thanks.
     
  14. Andrew641
    Joined: Apr 1, 2021
    Posts: 6

    Andrew641

    I think it might be the picture they are pretty evenly spaced.
     
  15. 1971BB427
    Joined: Mar 6, 2010
    Posts: 6,516

    1971BB427
    Member
    from Oregon

    If you mean the OP's picture, then yes it's an optical illusion. The Eatons had uneven spacing, not his axle.
     
  16. 1971BB427
    Joined: Mar 6, 2010
    Posts: 6,516

    1971BB427
    Member
    from Oregon

    I don't know of anyone who supports the rear axle you have. It is not one of the typical car 10 bolt axles you listed. But then the truck 12 bolt rear axle was unlike the well known car 12 bolt axle either. All you'll find for your axle are gaskets, and wheel bearings really. If I was planning on doing much in the way of upgrades to your truck, the axle would be one of the first things I'd swap out.
    I'd consider something completely different, but well supported by aftermarket too. A Ford 8.8", 9", or 12 bolt GM car axle. Plenty of inexpensive 8.8" posi axles, with good ratios that are dirt cheap at wrecking yards.
     
  17. banjeaux bob
    Joined: Aug 31, 2008
    Posts: 6,006

    banjeaux bob
    Member
    from alaska

    Sure like to see a picture of an HO72 with five luge wheels as well as the casting numbers of the drop in.
     
  18. 1oldtimer
    Joined: Aug 21, 2003
    Posts: 7,866

    1oldtimer
    ALLIANCE MEMBER

    That's an Eaton HO 33, I have one in my '56 panel.

    rearend-1.jpg
    Eaton HO33-1.jpg
     
    Last edited: Apr 2, 2021
  19. 1oldtimer
    Joined: Aug 21, 2003
    Posts: 7,866

    1oldtimer
    ALLIANCE MEMBER

    My old '64 had a Dana in it. You could use an axle up to '66 would be a direct bolt in (I think even up to '70).
     
  20. DDDenny
    Joined: Feb 6, 2015
    Posts: 14,600

    DDDenny
    Member
    from oregon

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