I'm sorry...I thought it was my wife's Jeep, not yours.4.88's would be overkill. 4.56 would be about right, but honestly why regear? Even with 37's mine will still hit 60mph in right at 8 secs. There is very little difference between the stock tire size and 37's performance wise. The tranny just uses the lower first and second gears for longer to make up for it.