TCC Shudder While the TCC Is Applying or Releasing - 4L60-E Transmission

If the shudder occurs while the TCC is applying, the problem can be within the transmission or the torque converter. Something is not allowing the clutch to release, or the TCC is trying to release and apply the clutch at the same time. This could be caused by leaking turbine shaft seals, a restricted release orifice, a distorted clutch or a housing surface due to long converter bolts, or defective friction material on the TCC plate.