The friction materials is splined on the inside, exactly where it locks to one of many gears. The metal plate is splined on the surface, exactly where it locks into the clutch housing. These clutch plates can also be changed when the transmission is rebuilt. The Automated Guide gearbox (AMT) https://gearboxauto33085.blogdal.com/34237354/5-easy-facts-about-gearbox-auto-described