Abstract: A fixture useful for orienting a stack of clutch plates of a multiple disc clutch or brake assembly is disclosed. The fixture includes three major components. A base receives a stack of clutch plates. A mandrel interfits with the base and slidably mounts a fixture plate assembly. The fixture plate assembly includes a number of posts which cause the protruding teeth of the reaction plates to become aligned axially when the fixture plate is driven toward the base. Plate retention posts carried by the fixture plate assembly engage the reaction plates so that they can be removed from the base and installed within the associated structure while maintaining alignment.