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Swaping axles, ration question?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by grtwhite, Sep 19, 2003.

  1. grtwhite

    grtwhite 1/2 ton status

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    /forums/images/graemlins/confused.gif I'm swaping out a 14blt ff with 4.10 gears, in favor a 14blt ff out of a 1 ton van. The van axle has 4.09 gears. I beleive it would be with in the margin or error and be fine, just wanted to make sure. Please let me know if other wise. Thanks! /forums/images/graemlins/thumb.gif
     
  2. Muddytazz

    Muddytazz 1 ton status

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    yep, it'll work....4.09, 4.10 and 4.11 are all safe together /forums/images/graemlins/thumb.gif
     
  3. Shaggy

    Shaggy 3/4 ton status

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    They should be the same ratio, I would bet that if you count the teeth on both axles they will be exactly the same. Somewhere along the line someone just rounded differently. Rule of thumb is within .02 is fine, so 4.09 with 4.11 would work no problem.
     
  4. grtwhite

    grtwhite 1/2 ton status

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    Thanks for the quick replys guys! /forums/images/graemlins/rotfl.gif I counted both axles the pickup was 41 & 10 and the van was 45 & 11.
     
  5. Shaggy

    Shaggy 3/4 ton status

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    How wierd, I wonder why they would do that...
     
  6. zcarczar

    zcarczar 1/2 ton status

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    Are you sure its not a Dana 60 or 70 that you are taking out of the van?
     
  7. jwduke

    jwduke 1/2 ton status

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    GM did have a 4.09, because my '75 3/4t, had a 4.09 ratio in it. Don't 1t GM vans use the 14 bolt???
     
  8. grtwhite

    grtwhite 1/2 ton status

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    Its a 14 blt. It came out of a 77' 1 ton ambulance. /forums/images/graemlins/pimp1.gif
     
  9. R72K5

    R72K5 Banned

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    gm had soem funky ratios, dont forget the late 60s and early 70s dana 44 3/4 ton 4.55 ratio

    then 3.40 in someof the 10 and 12 bolt rears.

    theres a few more odd ones


    4.09 to 4.11 would be fine, no worries, although try and avoid 4loc on dry pavement if at all possible
     
  10. 84_Chevy_K10

    84_Chevy_K10 Banned

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    Try to avoid 4 loc on dry pavement anyway.

    The rule of thumb is within 3% I do believe. Every tire comes out of the mold differently anyway so they also affect this.
     

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