For my '48 I kept the original bell housing and clutch and added a late 60's 3 speed (fully syncronized) which fit nicely-I did have to grind off the top ear of the trans mount for clearance. then put an 85 blazer rear with a 2.73 ratio so I can get on the freeway and keep up with my son's 53 half ton. An 89 s-10 driveshaft fit with not modification! I am putting in a trans. crossmember and bought a rear axle conversion kit from chevy duty-made friends with a welder. To keep the column shifter I asked our local High School welding shop to fabricate a bracket to link the '48 linkage with the late 60's transmission and it worked... still a work in progress- got disk brakes to add when they get here in a few weeks... things are coming together though.