two piece driveline

I was wondering if any of you with longbox 4x4 early 70s ford pickups have converted the rear two piece driveline to a one piece(I know it'd be long) and eliminate that crossmember mounted carrier?bearing? and converted to a one pc driveshaft. Is there anything factory that will replace it or would I have to have one made? Either is no biggie just curious if anybody has done this?
Thanks,
Jr.