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Im not sure what you want to know ,but if its the gear ratio start by pulling the cover then count the teeth on the ring gear then count the teeth on the pinion divide pinion # into the ring gear # and thats your ratio :thumbup:
 

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that is 12 bolt truck casting code

dirt common
seen the number on so many trucks i will never forget it
have owned a bilon of them
there is nothing else to know other than the truck 12 bolt were smaller pinion stem diameter than the car ones



good luck
 

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Don't try to count the gear teeth yourself until you find out if GM already counted them for you. Look closely around the edge of the ring gear. If you find a set of four 1-digit or 2-digit numbers, they already counted them, and their count is more accurate than yours would have been. Two of the numbers will be a date code, and the other two will be the tooth counts of the ring & pinion gears. Divide the big one by the little one to calculate the ratio.
 
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