you will need an adapter from the OE caddy engine to a modern GM tranny bolt pattern.
Adapters are expensive.
visit this site:
Originally Posted by BadA$$37
Im not much of an all original guy, I would like to pull the hydromatic out of my 61 Cad and replace it with a 700r4 or ????. I was hoping that some one might be familiar and have some recommendations for me. Just trying to get a little more cruise-ability and would like to do Americruise next month, so any input and swap tips would be greatly appreciated. Thanks for any and all help.