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How do you tell what gear ratio a rear has?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by RyansRod, Aug 25, 2002.

  1. RyansRod

    RyansRod 1/2 ton status

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    Is it stamped on the ring? And will it be a clearly idetifyable # like 3:08 or is there more to reading it?
     
  2. Blazer_Boy

    Blazer_Boy 1/2 ton status

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    Some fronts have a stamped tag on a bolt with the ratio. The ring gear will have two numbers together and you must divide the two to get your ratio.
     
  3. jimmyjack

    jimmyjack 1/2 ton status

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    Count the number of teeth on each gear and divide them 41/11= 3.73
     
  4. 74k5inVA

    74k5inVA 1/2 ton status

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    wasn't there something about lifting the wheels off the ground and spinning a wheel to count how many times the drive shaft went around or something. probably easier than taking the gears out. I can't remember though, exactly how this was done. somebody knows i am sure.
     
  5. jimmyjack

    jimmyjack 1/2 ton status

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    Yeh, but it's not really reliable or exact. You only need to remove the cover. The gears can stay put. Just mark a tooth on each one for a referance and count them. Matter of fact I think ( I think) there is a dot on one tooth on the pinion gear.
     

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