We ask to limit the engine rpm in 6th gear from 2600rpm down to 2250rpm in order to reduce the input speed into the T-case to an acceptable level.However, we have calculated the axle ratio and, if we use an axle ratio of 4,8 then we will reach the 140km/h at a reduced engine speed of 2250rpm in 6th gear. Further in this case, we also reach the required 80% grade easily.