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 - A 1937 John Deere Unstuck - by Gary Hickman. Here is my story of how I got the pistons out of a 1937 JD B that the engine had been stuck for about 14 years: About 12 years ago my Dad gave me one of the tractors I ran as I was growing up on our farm in central Nebraska. The engine on this tractor, a 1937 John Deere "B", had been stuck for 2 years before he gave it to me. This last spring (1999) I hauled the tractor to our 2 acre lot in St. Libory Nebraska where it joined my antique machinery collection, at that time a 1929 Caterpillar T
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