I have a np205 with the figure eight style adapter that used to mate with a SM465. I'm going to convert my Blazer to an automatic and want to put in a Th400 cause I was told they're the strongest transmissions made by Chevy. Will my NP205 mate with it, or do I need to find a round style NP205 for my TH400. Secondly, I've heard TH475 are the absolute strongest, but they're not four wheel drive units. How hard would it be to mate one with a NP205 or is it even possible?