your transmission could be shot. if it will not shift at all, then you will need a new one.
Type your answer here... My Allison transmission will only down shift, whats wrong with it?
if spedo dont work ether its a speed sensor
I believe your transmission is broken sir...Dont no wut to tell you.
you dont have to but it makes it a lot easier.
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.
maybe your transmission is going out or you dont have sufficent transmission fluid.
check the shift linkages for adjustment.there is also an actuator switch on side of transmission will prevent this. if those 2 checks dont fix the problem, your transmission is shot
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.
The transmission shift solenoids are bad!!