Here is an excellent product from Lubegard - an additive that instantly copes with transmission shudder at idle. The cause of shuddering is wear of friction in the torque converter. Instant Shudder Fix repairs and lubricates them, eliminating noise and vibration. The effect is felt immediately after pouring the product! The advantage of this fluid is that it provides 4 times less wear of transmission parts compared to conventional ATF-fluid. Suitable for all automatic transmissions.