Are you sure your jeep isn't a 97? Jeep didn't make a 96 wrangler. The 10th digit in your VIN will tell you what year it is.
S - 1995
T - 1996
V - 1997
Anyways. There have been many diesel engine swaps into Jeeps. The most common is the Cummins 4BT. It is a 3.9L turbo diesel that is found mostly in Frito-Lay vans, bread vans and other step vans. It produces 130 hp and 355 lb·ft of torque depending on the engine model.
Do a search for threads started by reevesdieselyj. He has a few threads on his 4BT engine swap.