Keep in mind with gear ratios, the higher the number, the lower the ratio. Ex: High-4.55, 4.10, 3.73, 3.42, 3.23, 2.92-Low
To tow, you want the lowest ratio possible, 3.73, 4.10 or somewhere around there. 3.43 is a high gear, for highway running empty, better fuel milage. For a diesel...