It is simply a raised trans-mount skid. It really makes a body lift worth while. They have them for YJ's but must be used with a body and motor mount lift. Also, if you already have a 4" suspension lift, the tummy tuck will require an SYE and CV shaft, possibly even pinion angle shims.
A few FACTS:
Rectangle headlights ARE kinda cool.
YJ does NOT stand for "Yuppie Jeep".
Jeeps should only have TWO doors.
You should ALWAYS wave at other JEEP drivers.