BETA: Tested. The goal for this mod is to create higher power, speed and range for select engines, transmissions and chassis. Mod title and edits subject to change. Current standalone: 2 engines for t680 & w900 does not replace any defaults. Cummins isx15 750 for t680 and w900 - heavy hauler. Horsepower 750 RPM max limit 3000 RPM limit N 2000 RPM auto shift 2400 high RPM auto shift 2000 low Torque at 1200 RPM 3282 Road Map: At least 1 engine for each truck 750hp or more. 1 to 2 Transmissions for each truck to have better ratios for speed/economy. 2 chassis for each truck to have increased fuel tanks and possibly 6x6 drive.(1 long & 1 short)