Hello everyone. I am new to this forum, but I have been thinking of doing a cummins swap for a while now. I have some questions though. I have an 85 f 150 with a big block bellhousing t18 and a 400 engine. I want to put in a 4bt but I am not sure what trans I will need. I have a smallblock t 19 and I can get a smallblock zf5 if that would be better. The truck has 410's right now, but will get 3.08's after the swap. It is a 4x4 so that has to be kept in mind. I also have a smallblock c6 if that would be a better choice.