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Thread: gm 12 bolt rear

  1. #1
    Senior Member EXPERT BUILDER
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    gm 12 bolt rear

    how do u tell if its out of a truck or car?
    and how can u tell what gears are in it already?
    the number on it is nf 3896888 dont know id thatl help or not

  2. #2
    Senior Member RACING JUNKIE
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    Only thing I came up with that number was it's a portable electric hammer drill :shock:

    hope this helps, Cp
    ***IN GOD WE TRUST***

  3. #3
    Senior Member RACING JUNKIE
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    You can pull the cover, count the ring gear teeth, divide that number into the pinion teeth.
    Ball park ratio.

    E.G ---> 39/7 = 5.571429 or what is commonly refered to as a 5.57 gear
    ***IN GOD WE TRUST***

  4. #4
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    ok its a 3.73
    but how do i tel if its out of a truck or car, its 6 lug, did they even put 6 lugs on cars?

  5. #5
    Senior Member DYNO OPERATOR
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    Truck has the smaller pinion shaft, car has the better larger pinion shaft and bearings. And if it has 6 lugs it aint no car axle if they are stock.
    Bruce

  6. #6
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    car should have the rings for the 4 link bushing,or did the cars also have leafsprings too? :? :? :? ops: ops: ops:
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  7. #7
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    Quote Originally Posted by montecarlo84
    car should have the rings for the 4 link bushing,or did the cars also have leafsprings too? :? :? :? ops: ops: ops:
    Yes, The camaro, & Nova come to mind.
    Bruce

  8. #8
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    ok cus the leaf mounts are at an angle on this 12 blt
    and on my stock 10 bolt they r straight

  9. #9
    Senior Member RACING JUNKIE
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    Quote Originally Posted by cepx111
    Only thing I came up with that number was it's a portable electric hammer drill :shock:

    hope this helps, Cp

    hahahahaha

  10. #10
    Senior Member DYNO OPERATOR
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    Quote Originally Posted by bowhay
    ok cus the leaf mounts are at an angle on this 12 blt
    and on my stock 10 bolt they r straight

    A truck the leaf mounts would be on the top of the housing as a F body will be on the bottom of the housing.


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