A built 727, isn't that an automatic? I am not converting from an auto to a 4 speed. It is a 3 speed, so I already have the pedals in place and the floor pans are already cut. I know I will need a new shifter , but can I use the rods from the 3 speed? I guess what I need to know is, when it comes time to sell my 3 speed, what parts are interchangable to a 4 speed and what can I sell? Thanks for your help.