My TH350 rear housing mounting flange is broken and rather than build a new one (replace the case) I was curious about the issues in installing a 86 TH400 and NP208 assembly. I have a line on a complete setup but was concerned if it is a bolt in to my 73 K5. Does anyone know if there are different mounting and driveshaft length requirements? I was told that the TH400 is longer but the 208 makes up for it resulting in identical driveshaft requirements. There are enough posts that deal with similar issues that I was wondering if anyone has ever put together a comprehensive parts swap/dimension/description list.