Abstract: A lock synchronizer for gearing has a sleeve coupled to the synchronizing body which is engaged with a shaft by tiltable pressure pins which can entrain a synchronizing ring toward the gear whose side coupling teeth are engageable with inner coupling teeth of the sleeve. In addition a friction ring is provided in frictional engagement with the synchronizing ring and with face gearing engageable with face gearing of the gear. The friction ring, however, is free to rotate and to shift axially relative to the synchronizing body in both the neutral and fully coupled positions and is rotatably entrained with the gear only when the face gearings mesh.