Hi pnora, little history on my 70 with grabby rears. Took my drums off to blast and repaint and noticed broken cable adjusters ( one on each side of rears ) one adjuster froze (fixed) and broken spring. Time for hardware kit and then installed. Now grabby brakes. Would over adjusting them out cause this? Drums slip on with some drag. Other thing is I stole my disc set up from my 70 Charger and rebuilt calipers, booster, and disc master with new. This was years ago and hardware kit 3 years ago and never drive the car til last 2 weeks ( work and life got in the way and only drove sparingly around the neighborhood) Added adjustable Porp valve but never had issues with the adjustment I set it at so thinking maybe I adjusted too far out on adjusters. Only variable is the hardware kit. Please let me know your thoughts on above and mega thanks!!!Most of the ones I see the problem is in the adjustment. The shoes need to anchor and if the parking brake is partially on due to stuck cables or adjustment they will not anchor. The correct procedure is parking brake backed off, shoes centered and anchored then the service brake is adjusted. After that the parking brake can be adjusted. I have seen the different linings for ever and have never considered that to be a problem. Axle lube leaks and oversize drums would also be an issue.