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How do I find out what gear ratio my truck came with? Is it something coded into the VIN?

 

I'm getting a tune and don't know which gears to tell the tuner I have

 

Thanks

Volt

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You need the RPO code of the sticker in the glove box. The code for the gear ratio will match one of these.

 

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

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You need the RPO code of the sticker in the glove box. The code for the gear ratio will match one of these.

 

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

 

 

So just match one of these numbers with the many numbers on the sticker and you're good to go? Looks like I have 3.73 with posi :cool:

 

What are all the other codes? Is there somewhere I can find a list of what the codes mean?

 

Thanks

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