Synchros in a manual transmission are used to slow down the gear before it is engaged so it doesnt grind
The synchros are going out on the tranny
synchros are pooched
Rev match better, your synchros are worn out. Your transmission needs a rebuild.
It would be hard to get into gear and would make grinding noises when shifting.
the synchros could be out in the transmission where it won't engage reverse. i believe that the check engine light may activate if there is a transmission issue. unfortunately, you will have to take it in for diagnosis.
If it's like other Fords, the synchros break down, preventing the transmission from changing gears. Getting a manual transmission should avoid this problem.
It is quite possible that your clutch is not disengaging the transmission from the motor. Also, your synchros could be bad, which would not allow it to go into gear.
The touch sensor controls on JBL Synchros 400BT cannot be disabled.
HeyJoe==They are not cleanable. If it is grinding between gears, the synchronizers need replacing. GoodluckJoe
Your transmission synchros might be going out. Also, shift slower and see if that helps. A Jeep isn't a racecar, so shifting slower is easier on the transmission. Changing transmission fluid to a different brand might also help your problem.
Luck
Worn synchros