I just went through this myself. Converted to BBP by purchasing Cass' axles. Was going to go rear disc but would have to buy his new brake lines & form/flare. Don't have the tools for that so went with the drum brakes (10x2.5) backing plate, shoes, and all hardware (bought on ebay). Existing master cylinder and brake lines did not need to be changed. Unlike the tapered bearings, I was a bit surprised that I had to drive the new axles in (could not push them in). Cass said to coat the outside of the bearing with some grease or diff fluid, then tap them in using a wood block and 2lb sledge. They popped right in. Since they are so tight fitting and have an o-ring on the bearings, should not have any more axle leaks.