Thanks 69fbman. 4h wheel drums stop the car on a dime--well at speeds less than 80 mph. Anyone who knows how to adjust drum brakes knows that the "drums suck" comes from people who don't know how to adjust them. A lot of professional brake mechanics don't know how to adjust drums.

The termology for the chatter is pulsation. The drums are out of round. You can buy a new set of drums for 1/10th the money you wrap up in disc conversion. In addition, drum brakes are much lighter than disc, and adding additional weight to what is already waaaayyyy to much weight in the front of the car isn't any bonus as far as handeling and performance.

Ain't no sense with trying to explain proper brake adjustment; also, it's too late. Buy the new drums, make a post, and I'll try to explain the way I adjust drum brakes.