Try adjusting the shifter.
Have someone inside the car move the shifter while the car is off. Look inside the engine bay and on top of the transmission. There is a shifter bracket moving.
Loosen the back and forth nut on the plastic piece and adjust it slightly to adjust the shifter. A little adjustment results in a big movement. And if you adjust it too far, first gear will become reverse so be careful. Try this before looking into a replacement transmission.
Have someone inside the car move the shifter while the car is off. Look inside the engine bay and on top of the transmission. There is a shifter bracket moving.
Loosen the back and forth nut on the plastic piece and adjust it slightly to adjust the shifter. A little adjustment results in a big movement. And if you adjust it too far, first gear will become reverse so be careful. Try this before looking into a replacement transmission.