Dog clutch skids on the leading shaft to rotate with it. Many of the equipment around the layshaft is fixed with it.  In the event the left-hand Pet clutch is introduced to skid towards the left from the gearshift lever, it messes with the clutch equipment, and the upper-speed gear https://gearboxauto63073.thezenweb.com/the-fact-about-gearbox-auto-that-no-one-is-suggesting-72169138