These transmissions are controlled by the powertrain PCM. They have no capability for range selection other than the selector lever. That is, there is no governor or other mechanism for mechanically regulating operating range. NOW, having said that, the basics are that the trans has sensors reading input and output speeds. This is how the PCM determines what range the trans is in. There are also a number of pressure sensors on the valve body that relay info to the PCM as to which hydraulic circuits are pressurized. Failure to shift into 3rd can be caused by solenoid failures as well as mechanical failures within the trans. To isolate which is the problem, I would start with a scan tool and see what transmission codes are stored - there will most likely be at least one trans related code. If the code indicates an incorrect gear ratio such as "incorrect 3rd gear ratio," it would point to an internal mechanical failure. If you have a solenoid failure, it would indicate that as a different code that would translate to a solenoid failure. Today's electronically controlled transmissions are not terribly difficult to diagnose, but do require at least a minimal scan tool. I have been rebuilding /repairing automatic transmissions for over 40 years. I do not know the exact powerflow in this unit, but it is likely similar to the 4L60/4L65 units.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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