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Thread: Rear Axle question ....

  1. #1
    Join Date
    Jan 2004
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    Geneva, FL
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    Default Rear Axle question ....

    Ive read the axle thread a 100 times ..... lots of options .. so now Im confused.
    Can someone tell me if this rear can be made to work in the M715 with a disk conversion?


    1990-1991-Chevy-GMC-3500-Pickup-Rear-Axle-Assembly-4-10-Ratio-4x4-OEM

    IT WORKS ON THE FOLLOWING VEHICLES

    CHEVROLET 3500 PICKUP 90-91 4x4; model VIN V, DRW, 14 bolt cover, 4.10 ratio (opt GT5)
    GMC 3500 PICKUP 90-91 4x4; model VIN V, DRW, 14 bolt cover, 4.10 ratio (opt GT5)


    also ....

    1988 89 Chevy 3500/GMC 3500 Pickup Rear Axle Assembly 4.10 Ratio

    IT WORKS ON THE FOLLOWING VEHICLES

    GMC 3500 PICKUP 88-89 4x2; model VIN C (5th digit), DRW, 4.10 ratio (opt GT5)
    CHEVROLET 3500 PICKUP 89 4x2; model VIN C (5th digit), DRW, 4.10 ratio (opt GT5)
    GMC 3500 PICKUP 88-89 4x4; model VIN K (5th digit), DRW, 4.10 ratio (opt GT5)
    CHEVROLET 3500 PICKUP 88 4x2; DRW, 4.10 ratio (opt GT5)
    CHEVROLET 3500 PICKUP 88 4x4; DRW, 4.10 ratio (opt GT5)
    CHEVROLET 3500 PICKUP 89 4x4; model VIN K (5th digit), DRW, 4.10 ratio (opt GT5)
    Last edited by teking; June 28th, 2020 at 04:00 PM.

  2. #2
    Join Date
    Feb 2007
    Location
    Bloomfield CT
    Posts
    313

    Default

    You really need to measure the width between the brakes and see if it will clear the leaf springs...The wide g-van rears are good for that.
    Is that real money?

  3. #3
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    Default

    Thanks Ray ... I'll think I'll just go with Hillbilly Wizard. They have the M715 measurements and will build me anything I want shipped to my door. I'm going to go with a D60 up front and D70 in the rear, four wheel disk, with the detroit locker in the rear. We are discussing gearing. 4.10 r 4.56. I have 4.56 now and I'm happy with those. So probably 4.56 based on a 37/38 tire. I'd like to run H1 12 bolts.

  4. #4

    Default

    How much are those custom rear axles running?
    Without a tape measurement, and all the variations from the factory “standard” axles it seems like a crap-shoot on getting the right width.
    Come and take it
    Go work at joann fabrics if you can't shoot a gun

  5. #5
    Join Date
    Jan 2004
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    Default

    You'd think but he's done a number of M715s and he working with my mechanic to validate measurements. And yes they are spendy but they will be dead on new with modern components and plug-and-play when they arrive. Sometimes you gotta pay to play. With the way it is now I spend more time fixing it than driving it. I'd rather be at the range than in the garage.
    Last edited by teking; June 30th, 2020 at 02:47 PM.

  6. #6

    Default

    I agree! I meant the standard numbers from GMC/Chevy/Dodge seem to be different depending from year to year, make and model that it can be difficult to rely on axles actually fitting according to the “axles that fit.” I should have written my response better. I would love to buy a custom axle for sure!
    Come and take it
    Go work at joann fabrics if you can't shoot a gun

  7. #7
    Join Date
    Jan 2004
    Location
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    Default Custom axles with H1 Hummer wheels & tires

    Please check my sanity:

    The stock WMS is:

    73.5" front
    72.5" rear

    I run a 10" 16.5 with 5" BS - 37x16.5 H1 tires so backside of rim to rim is:

    63.5" front
    62.5" rear

    I'm assuming the following:

    Dana 60 DRW front axle w/ hubs to 77.5"
    Dana 70 DRW rear axle w/ hubs to 77.5"

    Stock H1 Hummer rims are 9" 16.5" with 7" BS so so backside of rim to rim is:

    63.5 front
    63.5" rear

    Almost exactly the same tire placement as I have now .... Am I right?

  8. #8

    Default

    Just curious how much was the rear axle thinking on doing the same for the front and rear

  9. #9
    Join Date
    Jan 2004
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    Geneva, FL
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    Default

    The rear was roughly 3K with disk brakes, D70 4.56 gears. It also has a Detroit locker but i expec tg that may cost me extra. Havent gotten the official final number.

    UPDATE: so $2825K for the axle with disk brakes 77.5 WMS to WMS plus $700 for the locker, then tax , mounting hardware, etc.
    Last edited by teking; July 19th, 2020 at 03:09 PM. Reason: add locker info

  10. #10

    Default

    So I have a 725 I'm assuming these axles will work for me. If so can I call the guy and ask him to build me some

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