Quote:

I have a '75 Duster with sbp drums. They do exist. Dad has '74 Dart with the same setup as well.



I don't think anybody has said SBP drums weren't around after 72. In fact, the dealer books show /6 cars with drum brakes all the way though production in 1976. Parts books have the drums in them as well.

The federal mandate on disc brakes I believe was only on V8 equipped cars.

The vast majority of 73-76 cars have the big ball joint, PERIOD! There may have been some 9" brake cars that had small ball joint and they are the freak show part of the answer. Per the dealer info, the 9" brakes were supposed to be gone after 1973, 1974 and up, /6 A-bodies should have 10" brakes.

Easy enough to look at the castle nut to determine if it's small or large ball joint. ~5/8 = SBJ, ~13/16 = BBJ.

I'm sure more pontificating will follow.