Originally Posted by 4X Junkie
rear disk provide better stopping and are more reliable.
Big misconception there. Rear disk brakes stop no better than rear drum brakes do. Really. Neither are they more reliable. Disk brakes are easier to work on but that's about it.
The only benefit you'd notice after converting from rear drums to disk would be ease of maintenance. You certainly won't notice any improvement in braking.
Not to mention that the rear drum brake performance has to be limited by the brake proportioning valve to prevent the rear brakes from locking up too easily. When you brake hard, the vehicle's weight is thrown onto the front brakes & off the rear brakes. So the rear brakes can lock up much more easily in that situation. If the rear brakes are allowed to brake too hard, they will lock up & cause a skid. So even the drum brake's full potential cannot be used when on the rear. Making the rear brakes more powerful will just encourage them to lock up & throw the Jeep into a skid... which is why the brake proportioning valve is there to reduce how much braking force the rear brakes can provide.