Chevy silverado 6.2 towmax

Shouldn't be much to shoot out. Transmission ratios are nearly the same, 3.73 axle ratio is the same, and both 6.2L motor torque curves are the same. The difference is going to be payload, mileage and reliability.

What will be above the norm is the new 2014 GM 6.2L engine that's going to offer (estimated)420 HP and 450 lbs of torque.