i was wondering if i could change the spring of the rear shock for my weight instead of getting a brand new shock and spring ?

go to www.gmdcomputrack.com (http://www.gmdcomputrack.com) and look for a contact email address. im pretty sure you can change it out. but, you really would be better off with an aftermarket rear shock. and unless your doing trackdays or racing you might just want to jack up the preload on your current shock to save money.