One of the more frequent signs of a nasty torque converter clutch is shuddering or vibration, specially in the course of acceleration or deceleration. Even a minimum amount of oil in use, less than centrifugal pressure of rotation can start to press the piston and drag the clutch. Figure 6 https://devinmwdfh.worldblogged.com/40307837/the-definitive-guide-to-torque-converter-clutch