I had 3.80
gears with a 27 inch tall tire (285/30/19) in 6th I would run 65 at 1500 rpm. My warmed over LS1 idles at 950. If some one would slow me slightly I had to pull back to 5th because of the bucking. Changed to 4.11 and now 65 is at 1750...much better.
At 1750 RPM's I get 26 mpg. The LS1 made 425 rwhp.
I like the .50 overdrive as if I run 2000 it is right at 75mph. Easy cruising
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