I currently have 3.55 gears and looking to improve drivability and towing perfomance. Thinking about 3.73 or 4.10 gears. I don't want to loose a lot of gas mileage. What do you suggest and what size is the current ring and pinion set?

 

if you are going to do your gears i would say for you to go with the 4.10's. rule of thumb is to go up atleast 2 sizes to feel the difference. 4.10's are for towing.