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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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