I assume you mean the diesel 6.5 that came from these generation Burbs, and not the newer motors? LBZ, etc. I can't remember the engine codes off the top of my head. I imagine the gas mileage of the newer Duramax trucks are a lot better.Mitch, find a used 6.5 turbo diesel after 96 and you be fine !!!! easy swap and lots of power + way better gas milage !
My motor is fine, but I kind of had the same idea. It sounds like too much of a headache to swap over though.