Thanks guys! Great info. We bought Dart new in 74 from Tampa Dodge dealer. Front disc rear drum. Stamping on drums 11.090, made in Canada. Other stampings 80988-10, 55722, and 987. If I put a drum on with a lip at axle bore and tighten lug nuts, it takes the axle shaft end play out and locks up wheel. Acts like an axle shaft puller. That lip CANNOT be there. Tried 7 drums from different mfg. Shoes are 2 inch. This rear end has never been worked on either. All original. Maybe 72bluNblu has the answer.