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WTT 14bolt diffs

Discussion in 'Parts & Trucks Wanted' started by 1967k10, Sep 14, 2006.

  1. 1967k10

    1967k10 1/2 ton status

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    I need to trade a 14bolt FF with 4.10's for one with 3.73's or 3.42's. It's for my grandpa's 84' C20. He's trying to get better milege.
     
  2. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Going to a higher gear will no doubt make mileage worse not better. (It will take more pedal to move the same weight).
     
  3. 1967k10

    1967k10 1/2 ton status

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    He's 80yrs old and has had or has trucks with all gear ratios.His K20 with 3.73's does better than his K20 with 4.10's. They are identical trucks to the year. This is a manuel equiped truck not an auto,BTW. The Cummins boys always talk about the crappy milege with 4.10's,that's why they like 3.55's so well.
     
  4. 94yukon

    94yukon 1/2 ton status

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    do you just want to trade gears?. or buy them ?
     
  5. 1967k10

    1967k10 1/2 ton status

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    He wants to trade diff's. It's a lot easier to change a complete rear axle than gears in his openion. I don't know how to do gears and I'm doing it for him. I can change a diff in an hour or two :D .
     
  6. 94yukon

    94yukon 1/2 ton status

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    I do have a 14blt with 3.73 but shippping would be alot . the gears are easy to do in a 14blt , verus a d60 . the 14blt has spinners to adjust side to side . the info you need to set the gears is on this web site somewhere, but thats up to you
     
  7. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    I don't agree with this at all... In some driving circumstances it may apply.. But for highway driving, no way... Stop and go, city driving, probably...

    Ideally, mileage is best where h.p and tq peaks cross on an rpm graph... Over-lugging an engine and too many rpm's are BOTH detrimental to mileage...
     
    Last edited: Sep 16, 2006
  8. Emmettology 101

    Emmettology 101 3/4 ton status

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    I have just the gears(3.73's) if you're interested...
     

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