blahblahblahity blah. haters... Just so you guys know....bodylifts aren't what they were back in the 80's. EVERYTHING has been taken care of with these late model bodylifts. EVERYTHING. I think the thousands of us running BL's on late models for YEARS will strongly disagree with those that say they're unsafe.
BACK TO THE TASK AT HAND.
I bodylifted an '08 a little over a year ago. There are not kits for the 08, but the 01-05 PA (performance accessories) kit includes everything you need except for the following differences. The only difference between the 05 kit and the 08 truck, is the fuel filler vent tube size. It was different. I want to say it was 1/4" on the 08 and the kit came with a 5/16 and 3/8" extention. This was solved by a trip to a local hardware store for some hose, 2 hose barbs, and 4 hose clamps. Done.
Shift extention is required for a nice looking interior.
Install isn't very hard at all. I've done 4 now. With an air impact, floor jack and a block of wood, and a friend, it's fairly smooth sailing. The instructions included in the kit are top notch. They were very good instructions. Searching on here or on other forums will lead you to sticky articles dedicated to installing the lift. Shoot...I think in our tech section there's a walk through. Anything that covers a 98+, will relate directly to your '08. Install isn't hard...if you can tighten and loosen a bolt, you can install a bodylift. But...it is time consuming with alot of checks of wiring, hoses, cables, etc.(allcovered in the instructions). I've caught myself saying "installing a bodylift is stupid easy, just takes time".
BUT....if you are not the one doing the install and you're paying someone to do it, you're better off buying a suspension lift. The only one out there now is the 4" superlift. You can fit 33x12.50's very comfortably. The reason I suggest this is that awesome hourly rate of labor you'll be paying. 8-12 hr install of bodylift vs 3-4hr install of Superlift. In the end, you'll be within a few hundred bucks of eachother. I've read labor quotes and labor paid of upward of $1500 CDN, then the kit ontop of that.
Alot to read, I know, but I leave you with a 2008 XLT 4x4 w/ prekey mod with conservative torsion crank, 3" bodylift, 15x8's and 33x12.50's....
good luck with your decision.