I have 3.73 gears because I ordered it with max tow package and that's what you get. I have 275/60/20 33" tires and the speedo is accurate. I can hardly bring myself to say it, but it has almost too much power. Not really, but definately more than I'll ever need. In retrospect I would order the highest gears and try to get more fuel economy, and still have plenty of power. My brother also has one with 3.31 gears and it's better with more than enough for towing.

I think I made a common mistake when ordering. I didn't account for the fact that the booster makes max torque at about 1800rpm while most make it at 4000+ (which really means they're not making much at 1800!). This truck runs about 1750 rpm at 65 mph. It's making max power right where it's running. Hardly notice the hills.

Pilgrim