Hi, Another newby from Alberta! I'm in the early stages of restoring a sprint car built in 1965 by Grant King. It has a Halibrand quick change diff. I had an awful time getting the rear cover off - no way would a gear change ever be "quick." I thought that the problem was bent studs, but no, once I got the cover off it turns out that one of the two shafts is .001" wider than the other. I would call it a machine-press fit. Has anyone familiar with Halibrands ever come across this issue? My best guess is that there was damage at some point and a new shaft was poorly machined. Ever heard of Halibrand turning out a diff with such a flaw? Any thoughts would be appreciated.