Hey guys. New to alot of this wheelin stuff, but i have an '87 which is mostly used for just off roads. It has 3" of lift front and 4" rear and 33" tires. Has stock 3.55 gear ratio. I really want to get new gears because even in LOW its not low enough. What ratio do you suggest? Also what will this do to my fuel mileage and around how much am i looking at for a shop dp to this, as i have no clue how to do gears. Thank you!