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  • 3 Post By glennsexton
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  • 1 Post By TooMany2count
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Thread: IDing a GM rear end
          
   
   

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  1. #1
    TooMany2count's Avatar
    TooMany2count is offline CHR Member Visit my Photo Gallery
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    IDing a GM rear end

     



    It’s supposedly a late 60’s early 70’s Cutlass rear end. Trying to figure out what it is so I can get brake parts for it without guessing because of all those crack auto parts people we have now.
    Can anyone tell me what I have other than a GM rear end??
    Here some pictures of the casting numbers I have found
    Last edited by TooMany2count; 05-26-2023 at 03:00 PM.
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  2. #2
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    Anybody??????
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  3. #3
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    Casting #3917123 is for 1968 Chevelle, 10-Bolt, 8.2” (12-Bolt Casting #3917124). The casting numbers may have either a prefix or suffix of "N" or "NF" they have no significance that I’m aware of. If you can find the numbers on the axle tube, I can get exact stuff, i.e: “XXMMDDP”

    XX – ratio and type (standard, posi, metallic brakes, etc. – 47 different possibilities).

    MMDD – Month and day of assembly

    P – Assembly plant
    • B = Buffalo New York
    • G = Chevrolet Gear & Axle
    • W = Warren Michigan
    • K = McKinnon Industries
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    And I thought the only vehicle specific info for a differential was on the stamped steel tag that's usually lost the first time the nuts are removed from the housing/cover studs!
    Glenn, you're the font of GM knowledge!!
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  5. #5
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    Glenn thanks for the info… I’ll see if I can get the other numbers from the tube, if I can find them and if they’re still there..joe
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  6. #6
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    Quote Originally Posted by TooMany2count View Post
    Glenn thanks for the info… I’ll see if I can get the other numbers from the tube, if I can find them and if they’re still there..joe
    Sometimes they're grease covered and look like a third grader put them on with a metal stamping set!
    Mike P and TooMany2count like this.
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