If your going to 33" or 34" tires this will help return some of your fuel mileage and performance a tire this size takes away.
I cant find it right now but theres a chart floating around that recommends the best gears for different size tires. Off the top of my head most 33/34" tires will use a higher gear ratio than 3.73, your probably looking at 4.10 or 4.56 to bring the performance and mileage back close to stock.