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Power drums work fine for an empty truck. At least for the first few stops. If you build up any heat in them though you're in trouble. Fill the bed full of firewood or hook up a trailer and it's dangerous. Had to take a detour one time towing an empty 24' trailer. By the time I reached the bottom of the hill with my power drums, I had both feet on the pedal and was pushing the seat through the back of the cab. Still rolled through the stop sign. Another time in a different truck(68 gmc) I had a load of firewood in the back. Slight downhill grade, both feet on the brake pedal and I missed my turn off.. by a 1/4 mile! Definately not a safe feeling. That truck was even a 4spd and I was gearing down. Both trucks had new brakes/drums/cylinders at all 4 corners. First thing I do to a project. My 70 now has a 6 lug conversion. Best thing ever. Only one thing I'd like to remind people about converting to disc, this will widen the track of your front end. I'd just gotten a new set of 15x10s with 4" back spacing on all 4 corners. With the drums they fit perfectly. Flush with the fenders front and back. Never even thought about how that would change with discs. Now with the discs the front wheels stick out of the fenders an inch on each side. It's enough that I can see it throwing water up when it rains. Should've had more backspacing to make these fit right.