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final gear ratio

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by DBLAZER, Jul 6, 2000.

  1. DBLAZER

    DBLAZER 1/2 ton status

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    I know I know, it has probably been asked a thousand times before, but does anyone know the equation for figuring out your final ratio.
    here is what I have. a 700r4, 2:1 i beleive, i could be wrong, thats is in 1st. (i think) my new(im so proud) AtlassII with a 3.8:1 low , 5:13 gears and 38" swampers. DUUUUHHHHHH i have no clue

    89 w/DANA 60-Corp 14 w/5:13s n Detroit's. 4"lift 2" body. NEW AtlassII ordered 5-15-00. 38" sx's -
     
  2. JimmyDie6.2

    JimmyDie6.2 1/2 ton status

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    Location:
    Long Island
    ready? mph x rear end gears x 336 x tranny final gear divided by tire diameter. for me it would be:
    55mph X 3.42 x 336 x .7 divided by 33= 1340rpms...ouch
    TIME FOR SOME 4.10S.......hope this helps.

    Now, if im not in overdrive at 55:
    55mph X 3.42 X 336 divided by 33= 1915 rpms OK
     

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