Pet clutch skids on the principle shaft to rotate with it. All of the gear within the layshaft is set with it.  When the left-hand Pet clutch is introduced to skid to the left through the gearshift lever, it messes with the clutch gear, and the upper-velocity gear is achieved. https://ricardotwwur.educationalimpactblog.com/55809976/top-guidelines-of-gearbox-auto