transmission won't shift into 5th or reverse on 1993 Mazda B2600

My 1993 b2600i has decided to stop shifting into 5th or reverse. The shifter will go into that gate but when trying to go into reverse it just grinds. 1st gear is ok. 5th gear just won't engage

Asked by for the 1993 Mazda B2600
This sounds like an internal issue with your transmission, better get it looked at by a transmission shop.
2 answers
try shift fork, please let me know if it works..or what the outcome is, i have the same problem on 1993 mx3.... thanks sheila.. goodluck