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need help w/gear ratio I.D

Discussion in 'The Garage' started by lgk5, Oct 13, 2002.

  1. lgk5

    lgk5 1/2 ton status

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    need to know how to id a gear ratio
    is there a site to look it up if i have the numbers, or does anyone here know?
    8 8 72 dana 18679 a3e58 50-11 271
    thanks for any help
     
  2. fourwheelerjeff

    fourwheelerjeff 1/2 ton status Staff Member Moderator

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    50-11

    50 ring gear teeth divided by 11 pinion gear teeth for a ratio of 4.545454545 generally refered to as 4.56 to match the rear
     
  3. heavy4x4

    heavy4x4 1/2 ton status

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    Couple ways to check.
    Lazy man's way - look in glove box at RPO codes. There will be a code in there for the various ratios. If you want to go that route, I can find the codes for you (not hard to do yourself - type in RPO CODES in google).
    A little less of a lazy man's way - put your truck in neutral on a flat surface. Put a chalk line on the sidewall of your tire. Push your truck slowly while you have someone count the revolutions of the driveshaft (also helps if you mark that with chalk). Once the tire goes around one time, record the number of driveshaft revolutions. About 3, 3.08; about 3.5, 3.42; about 3 3/4, 3.73; about 4, 4.10.
    Wrenching man's way - remove diff cover and drain fluid. Count the number of teeth on the pinion and the number of teeth on the ring. Divide the number of teeth on the ring by the number on the pinion; that's your gear ratio.
    Hope this helps.
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    By far the most accurate is decoding the stamped numbers on the edge of the ring gear...

    I've never seen 50:11 before. I guess that's a 4.55:1 ratio.

    Rene
     
  5. fourwheelerjeff

    fourwheelerjeff 1/2 ton status Staff Member Moderator

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    those are the numbers on the ring gear, correct??

    what is this out of???
     
  6. lgk5

    lgk5 1/2 ton status

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    thanks guys the 50-11 worked
    i just got them the guy i got them from thought they were
    4.56 but was not sure,
    the front is a d44 with 50-11
    the rear is a 14b it says 9-41 sound right?
    yes the numbers were on the ring gear
     
  7. fourwheelerjeff

    fourwheelerjeff 1/2 ton status Staff Member Moderator

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    41 ring gear divided by 9 pinion is 4.5555555, so 4.56 is correct /forums/images/graemlins/cool.gif
     
  8. fulltopblazer

    fulltopblazer 1/2 ton status

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    I've got a ring and pinion out of a D44 and they are also 50-11 thats a dana 4.55
     
  9. lgk5

    lgk5 1/2 ton status

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    this is good news now i can install the rear for now and rebuild the front as cash permits ,or change the front 10b
    to 8lug ,
    just got a set of beadlocks 8lug 15"
    if i only had a garage to work in after dark!!!!!!
    thanks again for the help
     
  10. thatK30guy

    thatK30guy 1 ton status Premium Member

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    The 8 8 72 would be the date. August 8th of 1972. You have a "first design" front axle. /forums/images/graemlins/wink.gif
     

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