not major, but you'll need to be changing spring mounting to dump the torque tube anyway you do it - the best bet is just replace the center section with a 55-59 pumpkin, keep the original housing
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
