Firebob, I did have to change the U-joint but I just told the guy who was rebuilding the rear what it was going into and he changed the u-joint. As far as the drive shaft you will have to have 1" cut off. To me that seems a lot safer than cutting and rewelding perches and also a lot cheaper. I also did this swap on a 67 Camaro and to have the driveshaft measured,cut and balanced was $120 at a local differential shop.