OK, this shouldnt be too hard. Your driveshaft angle will almost always be the same on both ends if you have both the axle and t-case flat. Too see if you have too much angle, place the driveshaft up in place, then look at the Ujoint assembly. If the knuckes are contacting, then you will destroy your housing in a few miles. If you have 1/4 or more clearance in all directions, it should be good. However, it that much lift, im surprised they reach at all. You may want to consider having custom driveshafts turned. Oh, and FYI, a body lift doesnt affect driveshaft travel. All that does is raise the actual tub.