Superchips 3855 Flashpaq for Dodge Ram Diesel 5.9L 24V Cummins Diesel/Ram 6.7L Cummins Diesel Complete drivetrain tuning for your 1998 - 2009 Dodge Cummins Performance, heavy load towing andfuel economy tunes included Speedometer calibration for axle gearand tire size changes from 22.5 inch - 42 inch Industry leading horsepower and torque gains Read and clear diagnostic trouble codes