i have a '64 chevy van (3500 lbs and aerodynamics of a large brick). 200 4r trans, 4.11 12 bolt posi and a 292 with clifford cam 206 @50 and .513 lift. 26" tall tires. i am very pleased with the performance around town, pretty quick for what it is but freeway leaves me feeling as if it should shift one more time. roughly 2000 @ 50, 2500 @ 65 and 3000 @ 80. before we get into the whole mileage thing, i really dont care about that nearly as much as giving up anything off the line. first gear gives me a final ratio of over 11:1. it had a slight improvement over the stock 3.36 gears but cant help but think it is too low, like granny gear? am i making a lot of noise without taking advantage of the torque? rear has to come apart so now is the time to swap gears but on the fence about keeping 4.11's or installing 3.73's. dropping a couple hundred rpm's and better mileage would be a bonus but not my main concern.
