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1995 Gmc 2WD 5.7L

Discussion in 'GM Powertrain' started by Jeepguy, Apr 14, 2009.

  1. Jeepguy

    Jeepguy New Member

    Does anyone know what the factory sent out for rear diff gear ratio in these.
  2. 95CTburb19

    95CTburb19 Epic Member 5+ Years 1000 Posts

    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...
    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

    HC4 -- AXLE REAR, 4.56 RATIO

  3. Jeepguy

    Jeepguy New Member

    Thanks Man very helpful

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