|Originally posted by Mantioch:|
One question: would that cause the shifter to physically not be able to move in any direction?
If the clutch isn't fully disengaging, then you won't be able to move the shifter when the engine is running (except side to side). If you can't even move the shifter when the engine is stopped, then the problem is a mechanical one with either the shifter mechanism, the cables, or the shift levers on the transmission.
If you can't move the shifter even when the engine is off, then first try removing the shifter console (shifter knob and the four screws under the ashtrays) and make sure there isn't any obstruction like loose coins or other objects that may have fallen into the mechanism. If that's not the problem, the while you're there, have a good look at the shifter mechanism itself. A number of folks here have had cracks develop in the shifter assembly which prevented them from shifting properly since the entire mechanism would bend or move in way it wasn't supposed to.
Lastly, if that's fine, then get a helper to move the shifter as much as possible while you watch the levers on the transmission. A side to side motion of the shifter should result in the shaft coming out of the transmission to move in and out of the case. A fore and aft motion of the shifter should result in the shaft rotating. Some people have experienced broken cable ends, worn levers at the transmission, and broken cable brackets at the transmission. Look for all of these things.
[This message has been edited by Bloozberry (edited 05-18-2014).]