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your transmission could be shot. if it will not shift at all, then you will need a new one.
The VSS (Vehicle Speed Sensor) is probably bad. Also check the fuses.
Type your answer here... My Allison transmission will only down shift, whats wrong with it?
try transmission sensors
The cable/linkage between the shift lever and transmission is likely broken or disconnected
you need a clutch that's all
There could be a number of reasons why your truck will not shift properly. There could be something wrong with your clutch or transmission.
On the side of the transmission. It is called a solenoid pack. To change a shift solenoid you must replace that. Having been in the transmission business for a long time you probably have more wrong than that with that particular transmission.
A bad sensor can cause the vehicle to shift at the wrong time or not at all.
need more info.year,model.
The transmission shift solenoids are bad!!
On my 1990 Voyager, the transmission has a "safe," or "limp" mode. If something is wrong with the trans, it will not shift out of second gear. This is supposedly to allow you to drive to the repair shop at a reduced speed.