[Clyde65]

If you run ALL highway and you can run at 80 then the 3.08's will work and get you decent mileage. If you drive ANY in town then the 3.42's will work, 3.73's will be good for a mix of both and if you drive it hard and love to get her sideways, then 4 series with 4.10 are the animal you need.

I am figuring this with 28" tires but to be really sure, find your 4the gear ratio in the trans, tire size, then go to Randy's ring and pinion to see what your RPM's will be at what speed. I believe your cam specs should tell you the motors sweet spot for rpm, you want to keep the motor there to get the best economy.

Btw, if you have a 400 what kind of mpg are you thinking your gonna get?
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