don't do gears. I had em on my truck. I had 46's and 5.38 gears no difference AT ALL. Stay 3.73 or 4.10 tops. I went back to 40's and 3.73 and lovin it. 10 mpg in town and 17 mpg hwy on swamps tuning
You definitely need gears. I lifted my truck 8" with 38" tires. It drove like crap until I got 4.56 gears put in it. That made a huge difference. Your transmission will thank you.