This sounds like a Clutch Release Bearing "Throw out Bearing" problem to me.
If you need a new release bearing it's GM number was 907397 for the 4 cyl. and 907963 for the V-8. Release bearings seem pretty easy to find online. The other bearing is the Clutch Shaft Bearing which is at the opposite end from the pilot bearing (7109). The GM number was 954294 which converts to a 88026 bearing of which there are several on Ebay tonight. As for the torque tube bearing replacement, it might be easiest to pull the engine and have access to the clutch, torque tube, and front Transaxle extension all at once. Just my opinion.
I'm sure there are lots of others to consider.
JK
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