Is it a hydraulic activator?
Clutch Replacement - Chevrolet K-1500 ' GMC ' Chevy ...
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Jan 17, 2012 - Uploaded by ClassicManuals.net
Clutch Replacement -- Chevrolet Chevy C/K 1500 Clutch Replacement. GMC K1500 5.7 liter Clutch ...
SOURCE: Manual transmission clutch will engage
There are two possibilities to consider:
You didn't mention a fluid leak, so that would eliminate the obvious cause of a leaking pipe. However, check for leaks around the master cylinder (on the firewall) and at the front of the engine by the clutch itself. This would indicate which of the two might be the problem, If they haven't been replaced in many years, it's probably sensible to replace both at once. The slave cylinder can be replaced without removing the engine. If you have ABS, you'll likely need to loosen/remove the alternator.
Good luck!
Saabreur
SOURCE: 2006 GMC Canyon manuel transmission.
What it sounds like is that your pilot bearing has gone out, and that could be causing the high pitch grinding noise and when the gears are hard to shift that is a tale tale sign of a bad/weak pressure plate and or master cylinder. I would recommend changing out the clutch, pilot bearing, pressure plate, slave cylinder and having the flywheel resurfaced.
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