Join Date: Aug 2000
Location: Ft Worth, Tx USA
Devil's Lake makes a valid point,before you tear any thing down take all the belts off and start it and try it in netural and see what happens.
One other thing comes to mind. The diaphram style pressure plate (PP) has flexable straps in several places around it to allow the center to henge,so to speak,so it can move away from the clutch disc in order to release.
I had a guy who road raced his Corvette,which had a small block that would turn 9500,and down shifted so hard at such high rpm that it bent all these straps/henges and the whole inside part of the PP became off center and developed a bad vibration.
Here is what I would do, if you pull all the belts and still have the vibration,when you take it apart to change the fly wheel,stop after taking the clutch and PP off.Start the engine with only the flywheel to see if it still vibrates.CAUTION with the weight of the clutch/PP now gone the engine will rev up MUCH quicker than normal,so bring it up easy.
If it still vibrates change the flywheel,and if it don't replace the PP.
One other thing check the pilot bushing.