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is this a posi?

Discussion in 'The Garage' started by makovai, Nov 26, 2006.

  1. makovai

    makovai 1/2 ton status

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    I identified the ring and pinion as a richmond 4.56
    but i'm still trying to figure out if its a posi.
    Is this picture enough to tell. How can i tell?

    This is the 12 bolt out of my 72 blazer.

    [​IMG]
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Looks to be an open carrier. Take a pic of the ring gear side of the carrier. Also how did you tell what gear manufacturer? Is it marked Richmond on the gear somewhere? What are the teeth count of both gears.
     
  3. makovai

    makovai 1/2 ton status

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    Like this?
    [​IMG]

    As far as the gears, yes they were well marked on the ring gear so it was easy to id it.
     
  4. Confedneck79K30

    Confedneck79K30 3/4 ton status

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    yeah thats an open
     
  5. makovai

    makovai 1/2 ton status

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    Ok, so whats open mean exactly. does that mean this isn't the original rear end. my glove box id says posi.

    [​IMG]
     
  6. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Get a much better angle pic so that i can see the ring gear bolts and the carrier near the cap.
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Well if it has Richmond gears and 4.56 at that then someone has already been into that rear end since GM never put a 4.56 gear into a 12 bolt in a blazer.
     
  8. makovai

    makovai 1/2 ton status

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    like this?

    [​IMG]
     
  9. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Open...

    Was prolly a Gov-Bomb from the factory, although usually they called it a locking rear diff on the options sheet. The orginal carrier prolly got fragged in either case.

    Rene
     
  10. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Yep, and definately an open carrier. Looks like a thick ring gear also. That means your carrier is for 3.07-3.42 ratio.
     
  11. makovai

    makovai 1/2 ton status

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    meaning it could be the original rear end but someone change the entire carrier and gears? And there is no ifs, ands, or buts, it has 4.56 gears in it.

    And the final anlysis is its not a posi, correct?

    And there is no if's, and's or but's it has 4.56 gears in it. that i know for sure.
     
  12. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    That is correct. If you find the BOM number on the axle tube then someone can tell you what the application of that axle originally was. The BOM number is usually found on the passenger side axle tube on the top side just inboard of the spring perch.

    In case you don't know, BOM stands for (Bill Of Materials)
     
  13. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    It could be a swapped in 12 bolt, or a carrier and gear replacement...definitely not stock ratio and definitely not a posi, Gov-bomb or otherwise.

    Rene
     
  14. b454rat

    b454rat 1/2 ton status Premium Member

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    Couldn't have been a Govbomb, they didn't come out till the late 70s....Probly Eaton or Auburn style posi...
     
  15. JohnDeere

    JohnDeere 1/2 ton status

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    you know an easy way to test if its a posi or not is to put one tire on pavement and another on the grass and power brake it. both tires spin then its a posi. If you rotate the ring gear around to see the other side you can tell if its a posi or not. If it has a little latch with a spring on it that can swing into the spider gears then its a posi.
     
  16. Confedneck79K30

    Confedneck79K30 3/4 ton status

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    and if its a worn out posi or a posgovlok?
     
  17. Slapperbar

    Slapperbar Retired Navy NDT Examiner Premium Member

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    That one is a peg leg.
     
  18. makovai

    makovai 1/2 ton status

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    i'm not sure what you all are telling me here.
    I dont really care if its an original or not cause i've already converted to a 14bolt. I just want to sell this one and its kinda hard when i cant tell people what i have. I can say for sure it has spring perch distance for the 72 and older, it has 4.56 gears, but what kinda of carrier is it for sure.
    Can i shoot more picture? find more numbers? what do i do from here?
     
  19. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The carrier is a factory stock carrier.
     
  20. Confedneck79K30

    Confedneck79K30 3/4 ton status

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    it is an open carrier, that means NO posi
     

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