For the suspension lift, you should be fine with the stock driveshafts and brake lines. You may want to extend these items to give you "peace of mind" for when the suspension flexxes, but check everything out while the kit is going in. All I did for the brake lines was relocate the mounting points lower down, and make sure the driveshafts did not bind or hit any part of the frame or front cross member. Check the pinion angle of the rear driveshaft so it goes straight in or it's at zero degrees. Might need a shim to adjust that.
For the body lift, extend the shift linkage for the transmission, and the steering shaft needs to be extended. You might get by with the stock transfer case shifter, but it may hit the floor so that you can't get into 4-LO. IN that case, it needs to be modified. You'll also have to address the gas filler neck, radiator fan shroud, and bumpers.