What do I need to \"double\"? I am just investigating possibilities right now and was wondering what additional parts I will need so I can start looking. I've currently got a 465/205 in my truck and would like to keep the trans the same. I also have a 203 that was with a th350 and a th350 version 205 w/ slip yoke. Can I use anything from these 3 cases and what else do I need to "double up"?