I have 69,000 on the stock clutch and it feels like it is slipping in every gear when I rapidly accelerate. The car will just jerk mostly when it tachs over 2500. I also noticed in 4th gear cruising at 40 mph it feels like you are on a rough road but it is lightly jerking. Car is stock, 5 spd and have had no warning at all of clutch going. I had a 88 5.0 and it would not bark the tires and the rpms would go way up before it would catch. This 4.6 will still bark but the car jerks. I can tach the engine to redline in neutral and the engine runs smooth, only problem is in gear. Shifts great and transmission has been changed under warranty about 30,000 miles ago. Any comments, questions or help is much appreciated. Thanks Scott.