when you are installing perches on a dana 60 for E body, when they say 46" on center are you measuring between backing plates to find center ,then measure 23" each side from center
Basically yes , however in my experience centering the diff under the body usually this is not quite perfect as the right fender lip will end up maybe 1/2" too tight , so what I would do is set up the diff under the car centering it exactly to the body & creating the correct pinion angle with the perches in place but unwelded & the U bolts snug then tack the perches into place once you are sure it is centered & angled correctly , remove the diff & weld up the perches properly
