This may be totally unrelated, but I just had a similar problem with my car. It started with difficulty getting it into reverse and then the Shift Lever just completely disconnected, as in NO GEARS! I took the shift lever off (3 bolts, depending on how it’s cut away, should be accessible from the top) and when I felt aroung in the oil, I found a NUT. and the “saddle” (for lack of a better term) that the Shifter fits into was just floating around free in the oil. I found the threaded end of the Gear Shift shaft by feeling around and was able to get a socket in and reattach and tighten the nut. Now works perfect! I don’t know if this is the same problem, but I know it’s the same transmission so check it out. The nut being just loose would definitely make it difficult if not impossible to get the car in reverse.