Hey Hey, Froaders got u goin in the right direction.
Now on a more serious note, if ur just looking to jump...well...ur an idiot. good way to give ur expo a short life, just drive it off a cliff.
Moreso, what the other guy said is not quite right. Upgrading you shock will be good offroad, but it wont help u "Jump". neither will adding a resi. all they do is hold large amounts of nitrogen, and as the shock is working, IE. doing long, fast runs through the desert, they keep the shock cool, and working optimally without heating up and fading. They do nothing to help bottoming out, thats called valving which is a whole nother topic. just a brief FYI for ya. there is some good info on
www.dezertrangers.com , just dont ask gay "newbie" questions. use the search or you will be stoned. also the classifieds at
www.racedesert.com have many good parts.