I have a '93 C2500 that I am just starting to convert to 4wd, I got the truck for next to nothing and have been craigslisting parts, I have a divorce NP205, front 6" lift springs, the shocks that came with them, and a dana 44 front axle, in all I have less than $500 invested and I can fabricate all the brackets myself. there is still a lot of "small stuff" (crossover steering, brakes) that needs to be considered but I have no time limit and I enjoy building stuff from scratch so don't think it can't be done for cheap but don't expect to go wheeling with it next weekend.