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The standard ratio was 3.31:1. It really depended on whether the car was equipped with an LS5 or LS6, and which transmission was ordered. Basically, ANY ratio was optional from 2.73:1 through 4.56:1 with the turbo 400. You will probably never see anything numerically lower than a 3.31:1 ratio with a close ratio 4-speed, and the ONLY 4 speed available for the LS6 was the Muncie M22, which was ALWAYS close ratio. 3.73:1 and 4.10:1 were the most common for the LS6.

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