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Thread: gear ratio codes

  1. #1
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    Lightbulb gear ratio codes

    Does anybody now where to find the gear ratio codes and what they are. I was looking at a 07 chevy 1500 and wanted to now if it has the right gear ratio in it. i'm wanting a 3.73

  2. #2
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    Mine is the 3.73, 9.5, 14 bolt. Count the bolts on the diff cover.

  3. #3
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    Ok, i will check them out thanks for the info.

  4. #4
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    Welcome to da fowum grasshoppa !!! What you mean by codes??? Are you wanting RPO glove box codes?
    85 Sierra Classic K1500
    85 Silverado K10
    84 Silverado C20

  5. #5
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    Here are a few. Look in the glove box for 3 digit codes starting with G. G80 just means its Gov-Lok locking diff, so you could have another G code also. If yours is not listed, let us know what it is, and I am sure we can get it for you.

    GN9 : AXLE REAR, 4.11 RATIO
    GQ1 : AXLE, STD RATIO
    GS1 : AXLE REAR, 2.73 RATIO
    GS3 : AXLE REAR, 3.73 RATIO
    GS4 : AXLE REAR, 3.70 RATIO
    GS5 : AXLE REAR, 4.11 RATIO
    GS6 : AXLE REAR, 4.56 RATIO
    GT1 : AXLE REAR, 2.56 RATIO
    GT2 : AXLE REAR, 2.29 RATIO
    GT4 : AXLE REAR, 3.73 RATIO (DUP WITH 5 X 1)
    GT5 : AXLE REAR, 4.10 RATIO (DUP WITH GT8)
    GT7 : AXLE REAR, 3.33 RATIO
    GT8 : AXLE REAR, 4.10 RATIO (DUP WITH GT5)
    GTY : AXLE, WIDE TRACK
    GU1 : AXLE REAR, 2.41 RATIO
    GU2 : AXLE REAR, 2.73 RATIO
    GU4 : AXLE REAR, 3.08 RATIO
    GU5 : AXLE REAR, 3.23 RATIO
    GU6 : AXLE REAR, 3.42 RATIO
    GV1 : AXLE REAR, 2.73 RATIO
    GV2 : AXLE REAR, 5.83 RATIO
    GV3 : AXLE REAR, 3.08 RATIO
    GV4 : AXLE REAR, 3.36 RATIO
    GV5 : AXLE REAR, 3.55 RATIO
    GV7 : AXLE REAR, 4.11 RATIO
    GV8 : AXLE REAR, 2.72 RATIO
    GW2 : AXLE REAR, 2.56 RATIO
    GW3 : AXLE REAR, 2.56 RATIO
    GW4 : AXLE REAR, 3.31 RATIO
    GW5 : AXLE REAR, 2.73 RATIO
    GW6 : AXLE REAR, 3.27 RATIO
    GW8 : AXLE REAR, 4.10 RATIO
    GW9 : AXLE REAR, 2.93 RATIO (DUP WITH GU3)
    85 Sierra Classic K1500
    85 Silverado K10
    84 Silverado C20

  6. #6
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    Mine is a GT4

  7. #7
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    You wanna see a rare one? My truck has HC8 for the rear end gear ratio. Its in a full floater 14 bolt. 3.21 ratio. Wussy station wagon gears. No biggie, I use it to my advantage. I also have the Full Floater with 4.10's and a 14bolt Semi Float with 4.10's.
    85 Sierra Classic K1500
    85 Silverado K10
    84 Silverado C20

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