Body lifts on older frames suck IMHO because of the flex they seem to be alright on blazers and broncos and ramchargers and such but the pickups seem to fare worse on a newer rig though it would probably be ok I would imagine you know a 3" is alot more work than a 2" body lift. Does your frame tweak out when you are flexing now. I mean does it do it alot. If it doesn't do much than I say go for it :rotfl: :rotfl:
With a two inch lift you should be able to do it without messing with linkage, cables and lines. With a 3" you may find you have to adjust and move some stuff or adjust it where it enters the cab or goes thru the body. Like your t-case lever and filler hose(s).