This 46RE is in a 39 Dodge pickup. I'm running a Hot Wire harness with the 97 computer, there is a pigtail from the harness that connects to everything on the trans. I need to do an aftermarket floor shifter, or I need to build something (there is no room for any kind of linkage at the bottom of the modified steering column), do I need a shifter for a 3 speed auto, or a 4 speed auto? If I use a 3 speed shifter, do I need to add a switch for the OD to work? Gene