I haven't updated this in a while. A few weeks ago I installed a new steel rear drive shaft with rebuildable u-joints. Due to the mileage of the XK and angle from the lift the stock shaft was making noises and I was getting driveline vibrations. Just recently I also fabbed up a 3/8 inch transfer case drop (3/8 spacer between the transmission crossmember and frame) to help the rear pinion angle and angle of the shafts from the transfer case. I should have gone a little thicker, possibly 3/4 inch but not a big deal. The mod cost me about $20, helped the angles a little and also got rid of the driveline vibes I was having. I just recently hit 171,00 miles and will be replacing the transfer case soon along with a new Mopar transfer case shift motor.