A camshaft phaser including a gear arranged to receive torque from an engine, a housing non-rotatably connected to the gear and arranged to connect to a camshaft and a phase adjustment assembly including first gear teeth, second gear teeth and a hub arranged to non-rotatably connect to the camshaft and including third gear teeth and a displacement assembly arranged to for an advance mode, displace the hub in a first axial direction so that the third gear teeth non-rotatably connect to the second gear teeth and the hub is rotatable with respect to the housing in a first circumferential direction and for a retard mode, displace the hub in a second axial direction, opposite the first axial direction, so that the third gear teeth non-rotatably connect to the first gear teeth and the hub is rotatable with respect to the housing in a second circumferential direction.