I just joined and need help, 3.42 vs 3.73 gear ratio I am in the process of buying a 2010 GMC Savana AWD cargo can. I am getting the G80 differential and it will be AWD. I can get 3.73 or 3.42 gear ratio. I have no idea what to do here. I want good gas mileage and good performance offroad. What is the preferred gear ratio for vans, pickups, suv's?