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[quote="Ernie"]Pat

Your shudder strikes me as a clutch that is not fully engaging or a clutch that is slipping slightly.  This could be due to a weak pressure plate, a warped plate, flywheel or friction disk OR even a bad/glazed friction compound.  I doubt the throwout bearing has anything to do with your problem unless it is sized wrong and actually preventing full engagement of the clutch.

I had a 5 series that had a clutch that grabbed and shuddered slightly even though it had all new sachs parts.  Turned out the shock absorbing springs in the clutch disk were weak and one of them was broken.  The fact that the dealer refunded my money was small consolation when I had to tear everything down and reuse the original disk.   It showed very little signs of wear and was probably good for 150K of spirited driving.

I disagree with Bingbong's flywheel expertise.  If yours shows sings of warping or irregular wear, all of that can contribute to less than smooth clutch operation - Just as a warped brake rotor may cause a pulsing brake pedal.[/quote]

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