Originally Posted by GlennRMK

I like my 3.73s.

I would think lower gears would help city mileage as its easier to get it rolling.

I would get at least 3.55s, but I would opt for 3.73s personally.

I have 33" tires and 3.73s. I honestly wouldn't mind 4.10s as I do a lot of towing.

Originally Posted by Novo

Buddy of mine has an identical truck to mine with the 3.31 gears he pulls an enclosed trailer for his 4 sleds and a 5th wheel just fine. He said it does every bit as well as his 2000 7.3l f350 did. Oh yah lives in Idaho = lots of hills to pull that stuff over.

Originally Posted by Combat vet

I have a 5.0 Screw 4x4 with 3:73 gearing. Off the line power is strong and mileage is very good. Best highway is 21.3 with an average of 18.6. If I make short drives in the city, mileage varies between 14 to 15.5 mpg. I have always preferred 3:73 or 4:10 gearing for max power, especially when towing. With the 6-spd transmission, cruising rpm is not excessive, if I remember correctly at 70 mph my rpm is about 1600. Another plus: on resale, 3:73's have always been a positive selling point.

Originally Posted by ranken

My 2009 with 6 speed 3:55 was 72 mph at 2000 rpm. 20 mpg.