I'm thinking about changing out the three on the tree for a automatic.  Looking at a c4 tranny with the adapter housing on my 55 Fairlane with a 272.  My main questions are what to do about the transmission crossmember (existing or new & location), and what to do about the drive shaft?  Will the drive shaft have to be shortened, and if so by how much?  Also, I'm looking at a Flaming River column.  Have any of you done this and if so, what were the major problems. 

Thanks,

Mike