I have a Chevy 350, TH400, and LC 3speed tcase and am going to do a swap. I want to change the tranny to a 4spd. I have a LC4spd but everyone says don't waste my time and go with an SM420. I have also seen SM465's I believe was the number. What type of vehicle do I pull the tranny out of, and is there a 2 and 4wd version? I'd also appreciate it if anyone could give me a list of parts that I'll need for the job.