uummm, just my two cents here....
1) people always try and say your cheating if you use a body lift..when in fact, teh whole purpose is to get the truck higher so you can use bigger tires anyway...even on trucks with huge susp. lifts, most of teh new height is achieved via larger tires. So in reality, anyway you can get those bigger tires on your ride, do it if that's your thing.
2) 3" pa lifts are the best to use. That is if you have got to buy one and just cant figure out how to make your own for near nothing....A few new hockey pucks, grade five hardware, and a drill and your set. Much cheaper than buying a kit, and just as good I dont give a shit what anyone says.
3) PA kits last time I checked did not come with grade eight hardware....it comes with grade five. Well at least my boys did. And for one reason only that I could come up with..Grade eight will shatter and snap with any kinda of lateral pressure. Instead of bend and give a little, it will just snap. That's teh weak point with grade eight. grade five is almost as strong..but will bend and give a little, but not snap so damn easy. This to me is why they used it in the PA kits. Or at least used to. Been near 6 years since I actually bought a body kit. Once I learned how to build my own I never bought another.
4) Last but not least, if you go overboard and try anything more than a 3" body lift, you are gonna have issues. Body roll from hell, you name it.
Now, as far as other things you need to sweat when considering a body lift...
1) Your radiator is mounted to the body. Hence you will need to relocate it.
2) You will need to move your front bumper up..its easy just install washers under it to lift it up a little and drill new holes in on the bottom mounts and your golden. The rear, you will need relocating brackets. Or...and this is key here..many states you have got to keep your bumpers under a certain height or its illegal... you can install body gap fillers. These go in the space between your bumper, and body to hide the gap left there by raising your truck.
3) Next...never done this on a colly/canyon before..since I lowered mine..but i would check the steering linkage as well. My exploder that I lifted eight inches total was fine, it slid in and out of a sleeve..our trucks hell I dunno I would check that though.
4) Last thing I can think of is to check the fuel lines...or maybe the brake lines. When you begin to lift the truck, just go very slowly and keep looking everywhere for anything that is getting tight!! Then figure out a way to loosen whatever it is up!
I know this is a lot to take in...but its easy to do when you are actually doing it. And well worth it if you do it smart!! This along with a good susp. lift of say 2-3" will get you runnning some pretty damn aggressive meats in no time! Hope this helps man...