If the shifter feels funny, but the clutch checks out OK, I would take a
look at the shift linkage.
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also....
I would try putting it in gear and then pushing the car forward and back.
If in gear and the car resists moving forward or back, there may be nothing
wrong with the transmission.
If in gear and the car rolls forward or back, I would suspect that the shifter
and/or linkage is not putting the tranny in gear.