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1ton axle swap ques/help

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TXsizeK5, Jul 10, 2002.

  1. TXsizeK5

    TXsizeK5 1/2 ton status

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    If i went to an 14 Bff rear and/or an eaton one ton rear end. What all do I have to modify on there or will it bolt right up? Do i need bigger sized rims beucase of bigger brakes or can i just get 8lug 15" rims? Also, do they make a 6 lug conversion?
    Ohh 1 more question, doe sit hurt anyhting to run wider and more aggresive tires in the back... ie. 35x15.50 SX in the rear and 35x12.50 BFG in the front? Thanks
     
  2. reddog64

    reddog64 1/2 ton status

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    Re: Swapping rear axle

    should bolt right in

    and tire size (width) wont matter just run the same diamiter
     
  3. TXsizeK5

    TXsizeK5 1/2 ton status

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    Re: Swapping rear axle

    So that means i can use same springs, same ubolts, same driveshaft? And what about the rims, do i need to get bigger ones becuase of the brakes on teh 14b? Or do they even make 8lug 15" rims? thanks
     
  4. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Re: Swapping rear axle

    This has been covered to death, do a search for detailed answers to every one of your questions.

    Short story.
    3/4 to C14 FF will bolt in with possible exception of e-brakes and shocks depending on the source.
    8 lug 15" steel wheels will fit, even on the 1 ton.
    6 lug conversion is possible only with machine work. See Dorian Yeager.
    Avoid the Eaton, you don't want it.
    Driveshaft will need modification OR you can get a hybrid u-joint to adapt. Do a search for the u-joint part number if you want it, I don't recall...
     
  5. k30gambi

    k30gambi 1/2 ton status

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    Re: Swapping rear axle

    I'll add some gas, no, jet fuel to the fire. I think 1/2 tons have the rear shocks on the outside of the frame, my 1-ton has them mounted on the inside. I am 99% sure the spring pads are a different width apart, maybe some other ton luvers will know. So I think you will have to relocate the spring pads and shock mounts if you go with a ton axle but I think you will only have to relocate the spring pads if you go with 3/4ton rear end. /forums/images/icons/confused.gif
     
  6. BlazerGuy

    BlazerGuy 3/4 ton status

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    Re: Swapping rear axle

    The 3/4 ton, you don't have to change the pads/shock mounts just on the 1 ton.....
     
  7. TXsizeK5

    TXsizeK5 1/2 ton status

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    Re: Swapping rear axle

    So shock and spring perch relocations... whats wrong with the eaton rear end?
     
  8. BlazerGuy

    BlazerGuy 3/4 ton status

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    Re: Swapping rear axle

    I don't know much about the Eaton rears but I guess it'd be hard as hell to find parts for them, seeing as how they stopped making them in '72.....or was it earlier.....hmmm...
     
  9. BadDog

    BadDog SOL Staff Member Super Moderator Author

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    Re: Swapping rear axle

    BlazerGuy has it right, no parts.
     

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