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Axle ratios

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by horsepit, Jan 6, 2002.

  1. horsepit

    horsepit Registered Member

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    How do I find out what my axle ratio is on my 1987 Blazer with auto trans?

    Insearch of a Blazer.
     
  2. 73k20

    73k20 Registered Member

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    There is a way to do it by jacking the rear axle up, spinning the wheel and count the revolutions of the driveshaft and/or wheel. Maybe someone else could give you a better explanation of how that's done, but the most acurate way is to remove the differential cover plate and spin your wheel until you see some number on the side of the ring gear. There should be a Mfg.date, make and Ratio numbers. Good Luck!

    Who said size doesn't matter?
     
  3. thatK30guy

    thatK30guy 1 ton status Premium Member

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    But before you do ANYTHING....

    ....go to the glove box and look for the RPO code sticker in there. Read the codes and descriptions until you get to the "axle ratio" which will list the gear ratio.

    BUT, do not rely solely on the RPO code sticker. The ABSOLUTE best way to find out is to remove the cover and look for the stampings on the ring gear.



    I'm not picking my nose...I'm just pointing at my brain!! [​IMG]

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  4. 95 Silverado

    95 Silverado 1/2 ton status

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    some RPO stickers don't show the actual ratio, they show a series of three letter codes, find a site that lists RPO codes and find the code that corresponds with your gear ratio. most rear axle codes begin with G.

    '95 Chevy Silverado 1500
    5.7 V8-NV4500- 3.73 rears
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