Ken ,most big cities have brake reliners who will take care of the shoes for reasonable cost,the hydraulic stuff can be found as the other mentioned.
I've done a lot of big truck brake work, buy a wheel dolly for the dealing with the rear duals, a lot easier and saves the new seals from damage. When you're done with it, use it for other purposes or sell it.Follow the manual on the rear wheel bearing adjustment, the bearings get a heavy preload, around 60 ft lbs.And carefully inspect the rear wheel bearings especially if you drive it on roads, they are generally rust pitted.GM uses barrel shaped rollers, they can be tough to locate, but a bearing distributer can match up more common tapered bearings,probably.Brakes are fun, crude and the end result is very gratifing if done correctly.
