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Determining gear ratio

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TX Ranger, Mar 8, 2003.

  1. TX Ranger

    TX Ranger Newbie

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    79 2wd Jimmy, is the gear ratio identified anywhere? No mention of it on the sticker in the glovebox, dont see any tags on the diff itself. Anyone?
     
  2. Michael

    Michael 1/2 ton status

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    I'm betin' on 3:08. You can pull off the cover and count the teeth or jack it up and rotate the tire. Count the tire revs and driveshaft revs and you can come up with the ratio. Post in the Garage section and someone will know specifics on how to do this.
     
  3. prerunner1982

    prerunner1982 1/2 ton status

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  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Pull the cover and check the edge of the ring gear. The ratio will be stamped there along with a date code (build date)

    The last 4 numbers will be the build date (11 78 for example) the 4 numbers preceding the date caode are the ratio of pinion to ring gear teeth. 10 41 is 4.10's, 11 41 is 3.73's etc etc.

    Then clean the guts with some brake Kleen, slap some RTV on the cover and bolt it back up. Add some new gear lube and call it done. /forums/images/graemlins/thumb.gif

    Rene
     

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