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So, I'm thinking that whatever gear ratio you choose should have very little to do with street/highway driving, but more with what rpm the motor needs to pull in top gear through the lights. If you make max horsepower at 6500 rpm, then do the math for tire diameter, tranny ratio and what the car "likes" through the 1/4 mile....2 gears, three gears, 4 gears? If I was racing your car I sure would feel more comfortable using an automatic or manual hydraulic shifter.

By the way, my 418 runs the standard 3.73 gears with a Tremec 5 speed with .68 overdrive. Like others, I find first gear useless unless you're caught in heavy stop and go traffic for a period. Still don't like the 3.27 tranny first gear ratio however since both me and my motor don't like stop and go heavy traffic. If I were to do it over I'd get the TKO II and a 3.27, 8.8 rear.