hi,i have a 72 barracuda .when i bought it there was an auto column handle shifter column installed.i bought a nice 70-71 ebody 4 speed/floor shifter column.i pulled old column out and when i tried to install floor shifter column ,the shaft/ knuckle at the end of the column was about one and a half inches to short to connect to steering box gear.i tried everything,then took it out to measure against the column mount shifter column and found the floor mount column shaft with nuckle about one and a half inches shorter. any ideas of why one is longer than the other. can i swap the shafts out and if so how hard,thanks