Just to be clear regarding my statement earlier I assumed the OP'r was referring to the 4.3ltr models in which we cover the 98+

the 4 cylinder models we do cover their pcm's back to 97.

 

Drop a 5.3 or 6.0 in there and call it a day

 

That was the original idea, believe you me! At some point in time that just might happen. There's alot of crossmember hacking involved, and if ya have a 4x4 ya gotta lift the body 1.5 inches. Just alotta little details.............