A defective seal on the torque converter will result in the transmission fluid to leak out of the torque converter, and thus the stress In the converter are going to be shed. Slippage consumes ability during the coupling phase. Locking the converter shell towards the turbine shaft stops this slippage https://torque-converter-clutch26990.thenerdsblog.com/39760000/the-best-side-of-torque-converter-clutch