Hey FattyMcTrickle I dont know if you are still looking to do a Th400, But I had one built by Len Freeman of Performance Transmission of Las Vegas; that im am trying to sell. It has a all the parts for a 1000 hp tranny, with trans brake and manual valve body. It has a chevy bell housing but that can be switched, It has 0 miles and never been installed just sitting in the garge. Just throwing up an offer if you didnt want to go and find a tranny guy to build one.