While TCC is Applying or Releasing

If the shudder occurs while TCC is applying, the problem can be within the transaxle or torque converter.

Something is not allowing the clutch to become fully engaged, not allowing clutch to release, or 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 housing surface due to long converter bolts, or defective friction material on the TCC plate.