That �clicking� under the dash you hear is just the solenoid for the speedometer and really has nothing to do with the actual shifting.
Now, since it ended up �between ratios�, this means that the shifting screw has at least moved halfway thru it�s stroke.
Like Bob says, and since you�ve replaced the switch, check for good supply voltage to and thru the switch as you move the plunger thru it�s travel to both positions.
If this checks out, pull the square cover on the motor/shifter and either: 1. Clean those points or 2. Replace that little circuit board. Really doubt that the shift motor itself is bad, as it works sometimes and sometimes not.
Circuit is very simple. Power to and thru the switch and then back to the motor VIA the points on the circuit board. You'll see how that little vertical screw follows the shifting mechanism to make the proper connection to reverse the travel.
It really sounds like those points are burnt or dirty.
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Today's Featured Article - Trailering Your Tractor - by Curtis Von Fange. One of the fun things of summer and fall are the parades and tractor shows that go on across America. Many owners of tractors travel long distances to attend these shows and they usually take their restored iron along with them. Safe trailering practices and inspections will ensure that the event is a fun one. A good habit to develop when using a trailer is to give that �quick look over� before taking it on a trip. Before hooking up to it check the tongue for proper operation. The latche
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