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swapping from 1/2 to 3/4 to n axles?????

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by jamie72, Mar 4, 2002.

  1. jamie72

    jamie72 1/2 ton status

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    just wandering if i should keep my 1/2 ton axles or swap to 3/4 whats involved in the 3/4 swap and what are stock ratios in 3/4 corps.
    thanks all jamie
     
  2. arq

    arq 1/2 ton status

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    depends on you type of wheeling, most common ratio on 3/4 is 4.11. if you find a 6cyl 3/4 4x4 it probably has 4.56s

    ARQ.
     
  3. Triaged

    Triaged 1/2 ton status

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    A 3/4 ton 14 bolt FF won't bolt in but a 1 ton will (you do have to move shock mounts but not spring perches). You need a Napa #348 u-joint to match your 1/2 ton driveshaft to the 14B yoke.
     
  4. LKJR

    LKJR 1/2 ton status

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    now when you say a 1 ton will bolt right in, is that of the same generation or of the second gen trucks, or maybe it's just the second gen cause I know the easton rear was common pre ???? 72???
     
  5. Triaged

    Triaged 1/2 ton status

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    Correct on both counts...I should have been more specific. A 73-?? 1 ton 14B has the same spring perch width as a 1st gen Blazer. I have a 3/4 ton rear and it was no fun at all removing the spring perches. Than I had to make new ones because I don't know anyone who wants to weld cast iron to steel. I still haven't gotten it back to gether...If I had it to do over again I would find a 1 ton rear...you can drive with no rear shocks to get the tabs welded on...but with perches...
     
  6. 84_Chevy_K10

    84_Chevy_K10 Banned

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    3/4 ton axles are a striaght bolt in for shocks and springs. You'll need a 348 or 447 u joint to use your driveshaft.
     
  7. Triaged

    Triaged 1/2 ton status

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    1st gen blazers have the narrower spring perch width that the 1tons have. It is the rest of the blazers that a 3/4 ton is a bolt in.
     

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