1. In this position, the dog clutch is prevented from engaging. 2. Most cars featured-litre, 4-cylinder dog clutches . 3. In normal operation, the dog clutches mate, driving the transmission. 4. Once synchronised, they were locked together with a dog clutch for the record attempt. 5. Locking the output shaft with a gear is achieved by means of a dog clutch selector. 6. Frazer Nash were strong proponents of this system using one chain per gear selected by dog clutches . 7. Without slippage, dog clutches are not affected by wear in the same way that friction clutches are. 8. It was engaged by a dog clutch , activated when the reverser lever was set to " 0 ". 9. Among many different types of clutches, a dog clutch provides non-slip coupling of two rotating members. 10. Dog clutches are used where slip is undesirable and / or the clutch is not used to control torque.