Bud,
To my knowledge, there are a couple of wheel cylinders that you/we can upgrade too. One, is the Dodge 3500 wheel cylinder and the other is a Chevrolet 3500 wheel cylinder. Your truck should have a wheel cylinder with a 24 MM bore. The bigger Dodge has a 27 MM bore and the Chevrolet has a 30 MM bore.
I personally went with the Chevrolet wheel cylinders (About $15 a piece). You only need the wheel cylinders, some fresh brake fluid, a can of brake cleaner and the normal drum brake tools.
I removed my shoes and associated brake hardware. Cleaned the backing plate and hardware of brake dust. The new wheel cylinders are a direct replacement as far as fastener size. Install the hardware and adjust your shoes to fit as usual.
The Chevrolet wheel cylinders now provide enough brake force to lock up my rear brakes in a panic situation. Yes, my ABS unlocks quickly, but it is not and ideal reaction. During normal stop and go driving, I notice a marked difference in stopping force.
If you are loaded, or carry more weight than I do (empty mostly) normally, you should not lock up as easily as I do.
Either choice should provide a nice improvement over stock offerings.
Ronco