The traditional torque converter style dictates the stator be prevented from rotating under any condition, hence the expression stator. In follow, on the other hand, the stator is mounted on an overrunning clutch, which helps prevent the stator from counter-rotating with regard for the prime mover but allows ahead rotation. https://torqueconverterclutch75296.angelinsblog.com/33140139/a-simple-key-for-torque-converter-clutch-unveiled