2006 International 4300/DT-66/ Allison auto

[Sherman]

I need info on the tuner for the 466 pulling a 12000# trailer at 70 mph. I want to change the rear end gear to match the needed rpm of the 466 to cruise at 70 mph at sea level. I need to know at what rpm gives the best mpg at 70 with the tuner set at it's best setting to provide the power and economy. .71 is the 5th gear ratio in the transmission.

[mikel]

We dont offer a tuner, just the inline device that can increase power up to 30% on the fly.