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need gear ratio help!

Discussion in 'The Garage' started by mark livingston, Aug 30, 2003.

  1. mark livingston

    mark livingston Registered Member

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    stamped on my ring gear are the numbers 326663 gm 79, iv'e heard of a formula for determining the gear ratio using these numbers. if any yall know how to do this, please let me know. i gotta 79k5, 8 inches lift, 350 th350 np203 10bolt 12 bolt. i wanna run 38s, but dont know if my gears are too tall.any suggestions will be appreciated. /forums/images/graemlins/k5.gif
     
  2. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    That looks like a part number, look at the ring gear again for more info.
     
  3. doctor4x4

    doctor4x4 1/2 ton status

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    yea what he said right after these nu shold be a nu in the high 30tys or low 40 tys (ring gear count ) then a nu in the teens pinion gear count ) divide the big nu by the small Vola ya got the ratio
    probably 3:07 or mabe 3 :73
    ex: 11:41 = 3.72727272727272727272727 aka 3:73 gears :-)
    be carefull not to confuse it with the date of manufactor
    you ring gear should read like this (sample nu only)
    part nu---------------pinion -ring gear --------manufactored date
    G1213546754 ---------11:41-----------------------10:78
    hope it helps
    Randy
     
  4. mark livingston

    mark livingston Registered Member

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    i gues if i'd looked at the correct number your info would've helped out great. i'v already installed my new dif cover, so i'll just guess that since it's a 1/2 ton 4x4 it's probably got between 3:07 - 3:73 gears. ya think with 38's i'll need to re-gear? /forums/images/graemlins/thinking.gif
     

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