At this stage of the project, we installed the front conversion, master cylinder, and proportioning valve, while retaining the rear drum brakes. The rear disc conversion requires aftermarket "green" non-adjustable rear axle shaft bearings with snap-ring retention, and is not compatible with the factory tapered roller bearings. Since future plans call for a narrowed custom rear housing, it would be money down the drain to re-bearing our current axle shafts. The rear brake assembly will be included in the rear end build when we make the swap. Wilwood's proportioning valve allowed us to adjust the bias to accommodate the drums in the rear, and we can later dial in the braking system for the discs out back with a simple twist of the valve.