Driveline angles aren't affected by the body lift, but at 2" of lift and above, I've heard of minor adjustment of one of the shifters maybe being required.

As far as suspension lift...1.5-2" of lift won't be enough to affect anything adversely.

I have a Gen2, but I've got 1" of body lift and 1.5" of susp lift. I will be adding another inch of body lift ASAP. Though, my clearance is plenty for moderate/difficult crawling/trails as it is. Anything more will be icing on the cake for me...I don't do the super hardcore stuff. <img src="/forums/images/graemlins/kewl.gif" alt="" />