hey guys. im going to be gettin my baby back from the shop and i want to get some base numbers before i start workin on it. i hear people saying that they launch in 4wd and im just wondering how it is done. this is my first diesel and i have never drag raced a 4wd vehicle. also i would like to know how im able to tell what size gears i have in the truck. i think they are 4:10's but im not sure because the dealership gave me the owners manuals from a 2010 and mine is an '08. thanks in advance for the help. this site is awesome and all yalls truck are keeping me motivated to building my truck.