A flywheel after 180000 miles should at least be checked for proper thickness and resurfaced so the new clutch works properly. Yes, it must be removed to check it. I would just replace it. But even a new one needs to be properly surfaced--just like a brake rotor.
Before you go removing the transmission again try bleeding the clutch system. The bleed screw is located on the left side of the transmission, and the system is bled just like the brakes, using the clutch pedal of course. This may be the cause of the spinning noise. If the throw out bearing is not releasing all the way it may be putting pressure on the pressure plate causing a vibration at high speeds. If this doesn't cure the problem then the problem sounds like either a worn out thrust washer, or washers, inside of the transmission--or--a warped flywheel.
Sunday, March 2nd, 2008 AT 12:46 AM