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  1. #1
    Jr. Apprentice
    Join Date
    Apr 2009
    Location
    Grande Prairie AB
    Posts
    11

    Default 1995 Gmc 2WD 5.7L

    Does anyone know what the factory sent out for rear diff gear ratio in these.
    Thanks

  2. #2

    Default

    If you look in your glovebox you will see a series or letter/number combinations. These are known as RPO codes. They list the factory options that your vehicle is equipped with. One of these will be your gear ratio. You can look these codes up online. here are a few common ones for you to look for...
    GQ1 -- AXLE REAR, STD RATIO
    GT4 -- AXLE REAR, 3.73 RATIO
    GT5 -- AXLE REAR, 4.10 RATIO
    GU4 -- AXLE REAR, 3.08 RATIO
    GU5 -- AXLE REAR, 3.23 RATIO
    GU6 -- AXLE REAR, 3.42 RATIO
    G80 -- AXLE REAR, LIMITED SLIP (POSITRACTION)

    HC4 -- AXLE REAR, 4.56 RATIO

    Dan
    1999 GMC Sierra 2500 350 vortec
    1967 Jeep M725 ambulance 230 tornado
    1990 Cherokee Limited- 3 inch lift on 33's
    ...and every one of em has issues

    If you have any questions or problems don't hesitate to send me or any other GMTC moderators a PM

  3. #3
    Jr. Apprentice
    Join Date
    Apr 2009
    Location
    Grande Prairie AB
    Posts
    11

    Default

    Thanks Man very helpful

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