More details from the Wikipedia page:

"For serious off road capability, Isuzu offered the Ironman Edition Amigo which came standard with a DANA 44 rear end, Intelligent Suspension control (ISC), limited-slip differential, larger tires than the LS model, and adjustable shocks for off road. These are the rarest of Amigos, Isuzu only producing about 288 in 2000, 187 in 2001. (Isuzu did produce Ironman Rodeos and Axioms during those years as well)"

http://en.wikipedia.org/wiki/Isuzu_Amigo