With only a 2" lift, he's blowing smoke by saying your rear pinion angle is "pretty severe". A 2" lift doesn't actually change the pinion angle but it very slightly increases the angle between the pinion shaft and driveshaft. If you don't have vibes from that slightly increased angle between the pinion shaft and driveshaft where the u-joint is, don't worry about it. Upper adjustable length control arms are needed if you're installing a SYE and CV driveshaft but since you have neither, you don't need to adjust the rear pinion angle.
At most, if you had some minor vibes from your 2" lift, a simple 1/2" or so transfer case skidplate drop would take care of it for the cost of washers used as spacers and perhaps longer t-case skidplate bolts if they are the newer metric bolts that are shorter.