James, since I do not come from a top speed enviroment, I always wondered if a overdrive and rear gear set up that equals a the final drive of a 1:1 drive ratio would pull the same. For example the final drive with a .064 overdrive on a 3.90 ratio would be equal to a 2.50 ratio 1:1 trans high gear. Would the overdrive 3.90 run the same as the 2.50 ratio 1:1? Would it take more horsepower to pull the overdrive 3.90?
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