A little more info May help:
is the clutch disc (friction material) stuck to the flywheel? Do not know how this would happen -- possibly a slight "mismatch" of the splines / hub on the clutch disc versus the splines on the input shaft.
Or, has the pressure plate "failed" and the clutch is "engaged" even when you push the clutch pedal to the floor?
The 5 speed in my t/a has an "inspection plate" on the bottom of the bell housing?
Does your bell housing have something similiar?
Probably need to pull the trans, but maybe you can get lucky...