will i have to extend anything on my 1996 4 door blazer when i put on a 3 inch body lift?

 

yes, you will have to extend your fuel tank tube, steering linkage, and a few other little things, also 3 inch body kits do not come with bumper brackets so your bumpers will remain at stock height. Just as an fyi since you're new there is a lifting it section, a mod is probably going to move this, most of the time questions you have other people have already asked and been answered, often several times, the search feature is your friend