I have that kit on my '37, I purchased it in 1999, so it may not be the exact same parts. Mine is manual brakes, the truck is fairly light weight 3400 lbs, so no need for power assist. Yes they are for 1/2 tons. Mine uses '70 -'79 Camaro disks and calipers with a custom caliper mount to fit the straight axle. I've had no issues with it. I replaced one bearing, but it wasn't really bad once I cleaned it all up. If you go with a kit like this, write the bearing numbers and seal number down where you can find them, then check to see if you can get one local. Mine uses a standard GM outer bearing, and a Ford inner bearing on a custom made adapter, the seal is also for Ford. You sure don't want be out away from home and have an odd ball bearing go out. I use a Ford master cylinder, I believe it's a 7/8" bore. My rear axle is from a '79 Trans Am, drum brakes. I had a Firebird/Camaro master cylinder, but the bore was wrong with the pedal ratio I have, so I went to a smaller bore cylinder. I added an adjustable proportioning valve to the back brakes to limit the stopping ability, it would skid the rear tires on a moderate stop and really slide on a hard stop. This does make for a harder pedal, but it stops straight.
