Similar to a transfer case drop. Helps the rear DS angle, hurts the front DS angle, puts stress on exhaust, raises the fan closer to the top of the shroud, and puts the intake tube closer to the hood, which if there is a K&N it may not work.
There're big with TJ's and YJ's when installing a "tummy tuck" and the small body lift is needed, this helps driveline angles and helps with driveshaft vibes.