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Swapping 1/2 ton for 3/4 ton?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by nau81blazer, Feb 19, 2006.

  1. nau81blazer

    nau81blazer 1/2 ton status

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    Hello everyone,

    I have almost everything ready to swap in some 3/4 running gear in my blazer. I was wondering what all has to be changed out. Are the brake lines gonna hook right up? Do I need to change the master cylinder? I know that i'll need a conversion u-joint for the driveshaft end. Does anyone happen to have that part # handy? I know I will have to move the spring perches and all that for the rear axle, but what about the front axle? Does this front axle need a conversion u-joint also? Do the 3/4 D44 calipers need to be grinded to fit 15" rims?

    Sorry about all the questions, just don't want anything to surprise me when I get to doing it. Thanks for all of your help guys!

    --Adam
     
  2. alec78

    alec78 1/2 ton status

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    For the 1/2 to 3/4 change you don't need to change the brake hoses or master cylinder. They are the same. Only exception is later one MAY be metric thread, but i don't remember for sure if that is true. You'll only need to change the spring pearchs if the doner rear axle came from something other than a 3/4 pickup or 3/4 burban.

    The front axle is actually the same GM 10 bolt or Dana 44 regardless of 1/2 or 3/4 truck. The only difference is the hubs, discs, bearings, and backing plates. You can use the 1/2 caliper as in some 3/4 it is the same. Just keep in mind there is another available for the more HD 3/4. Also the front d-shaft u-joint does not need to be changed for the same reason.

    You will have to do some grinding. How much will depend on how much backspacing you wheels have.

    Sorry I don't have the conversion u-joint part number, but a search should find it for you. IIRC NAPA is the only parts house that carries them.
     
  3. nau81blazer

    nau81blazer 1/2 ton status

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    Thanks very much Alec! Well that answers every question except the conversion u-joint part number. Anyone know that one? Thanks Guys!

    --Adam
     
  4. Hossbaby50

    Hossbaby50 3/4 ton status

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    The part number for the 10b to 14b conversion is #447 and the 12b to 14b conversion is #348. Those are Napa part numbers.

    Harley
     
  5. nau81blazer

    nau81blazer 1/2 ton status

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    Thanks Harley! Appreciate all the info guys.

    --Adam
     
  6. 4xcrazy

    4xcrazy 3/4 ton status

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    Autozone can get them, but you usually have to order them in, usually a couple of days, Napa sometimes carries them, and they are PRICEY at both places, but obviously alittle cheaper at the zone.

    I bought my first one at Napa, and it wore out in about 3-4 months, the second i ordered from Autozone, and still running it now,,about 2 years later.
     
  7. nmud2deep

    nmud2deep Registered Member

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    when i swapped my axles i had my front cals. shaved alil to fit my wheels and i had to lengthen my rear drive shaft because it was almost pulled out of my trans....you lose a bit of turning radius with the wider rear axle but believe me it is all worth it because all these trucks are riding around on 35s or higher and at the littlest cut of a doenut they tear the gears out of the factory 1/2ton running gear.
     
  8. nmud2deep

    nmud2deep Registered Member

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  9. 4xcrazy

    4xcrazy 3/4 ton status

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  10. nmud2deep

    nmud2deep Registered Member

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    took a short to time mess it up and along time and alotta $ to get it that way and yet its go anywhere you can go and still turn heads
     
  11. SkulzNBonz

    SkulzNBonz 1/2 ton status

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    Cool, I'm in the middle of this swap, and this has answered a bunch of questions.

    John
     

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