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They vary depending on the engine package, tranny, etc. but you can find out by looking in your glove box's GM RPOCodes. It's the sicker on the inside of the glove box with numbers and letter. This will help you decipher your code.
rear axle ratio RPO
GU4 = 3.08
GU5 = 3.23
GU6 = 3.42
GT4 = 3.73
GT5 = 4.10
HC4 = 4.56
G80 - locking differential
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