[bobcowan]

Ford drums are designed to tighten (self adjust) when the brakes are applied in reverse. Also, the drums don't work as well in reverse, and tend to bind if things aren't right.

Take the rear drums apart and make sure everything moves the way it's supposed to, and it's rust free. You might also need a little grease on the backing plate where it contacts the shoes.

Also, make sure the brake rods behind the maters cylinders fully retract when the pedal is released. Had that problem with mine, and it let the front brakes drag just a tad.