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700r4....

Discussion in '1982-Present GM Diesel' started by 79k20350, Jan 13, 2006.

  1. 79k20350

    79k20350 3/4 ton status

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    So the next project is a turbo 6.2 85 k5. im gonna be running 38's & 1 tons w/ 4.10's. really i gotta keep the od to be able to get a decent highway numbers (right around 1800) then i got thinking. isnt a major problem, w/ the 700r4 that every thing was geared way to high? i thought that was a big problem (like 308's and od) so to get the rpms we need arent we basically dooinng our trannys from the begining?:confused:
     
  2. DieselDan

    DieselDan 1/2 ton status

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    Well I'm running a 700R (behind a 6.2 w/turbo no less) spinning 38x15 with a 4.56 gear. I do have to drop out of OD alot if I'm on the highway and hit a pretty good size hill (we got HILLS) and/or if I'm not pushing 60+mph. My 35" tires worked better with my OD/gear combo.

    Now with your 4.10 gear I think your right about not wanting an OD (.70).

    Tire Gear Trans RPM@65
    35" 4.56 .7to1 1992
    38" 4.56 .7to1 1835
    38" 4.56 1to1 2620
    38" 4.10 1to1 2356
    38" 4.10 .7to1 1650

    'Could build a pretty stout TH400 with maybe enough left over to flip for the lower 1st gear-set :thinking:

    http://www.4lo.com/calc/gearratio.htm
     
  3. 79k20350

    79k20350 3/4 ton status

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    i was figuring a 38x15x16.5 radial at 70 would be 1825. pretty much wear we want to be. im still thinking of 465 though...hmmm...
     

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