Doggy clutch skids on the primary shaft to rotate with it. All of the gear around the layshaft is fastened with it.  When the still left-hand Puppy clutch is introduced to skid to the left in the gearshift lever, it messes with the clutch gear, plus the upper-speed gear is https://gearbox-auto04814.activablog.com/32950382/top-guidelines-of-gearbox-auto