I have run 3.73 & 4.10. Prefer the 4.10 It really keeps the motor in the powerband, better than the 3.73s. And if you ever getting into autocross, you can run most tracks in 2nd gear w/4.10. With a 335/30/18 I'm turning roughly 2100 @ 80mph. 22-24 mpg highway.
Scott
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69 RS LS3/T56
68 firebird vert LS1/4L60E
67 RS LS2/T56
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