the only input i have is i was running the viper 6 speed with the .50 6th and tire size is close to yours in height 255/50/16 which they say is 26 tall going down the E way i had to go 83 mph to get 2200 rpm and not chug the engine this is with the 3.90 gear I put 864 rwhp and 767 tq at 5700 rpm with no problems so what im saying is the .50 6th was a waste for my combo good for nascar i know your not running the .50 but thought i would throw that out there. as you have a choice between to raito's also if your car rev's fast you will be on the clutch more then the gas that's what happened to me i ended up going to a 4l80e which i love.. good luck..
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