I have a 99 3500 4x4 with a bad V-10 I have a 2000 5.9L 24v 245hp ISB with an Allison 6 speed automatic already attached. I need to know what transfer case to use for the tranny so I don't lose my 4x4. most of the rest of the conversion will be pretty much everyday fabrication such as motor mounts drive lines and brackets. obviously there is going to be some extensive electrical involved but I will be able to ask questions about that as I go. Feel free to say what you need to or desire to cuz I have over forty years of working on big trucks. I will absorb any and all information take what I need for my project and store the rest in my memory banks for future reference. thanx lots.