I wanted to get some opinions about "what's the best gear ratio for towing?" Specifically, I have a 2001 Suburban 6.0 4x4 2500. It has the factory "heavy duty" towing package with 3.73 gears. This truck drives me to work about 3 miles each way. It also drives down the interstate during the summer months to my camp. I am usually towing equipment or my Travel trailer. We have a lot of mountain passes around. I'm not worried about fuel ecomony as it already gets maybe 13 mpg HWY and about 9-10 city, so thats out the window. I want a good highway towing gear that matches better to the 4l80 and the higher reving 6.0L in my truck. I can get ratios from 4.11, 4.56, 4.88 or 5.13 I was looking at the 4.56 maybe, but not sure if I'm going to kill the truck @ 70 mph. Would the 4.11 make a big difference? Or, should I look into 4.56 or even a 4.88? I don't like the 3.73 with the 4l80's 1st gear, it tachs out in 1st at about 45mph I want to get a better "get up and go" 1st gear for the truck and possibly utilize all 4 speeds on the highway when towing instead of shifting it back to 3rd for crusing. Over Drive with a small trailer on a slight grade is just no power with the stock gearing. What do you guys think?