Medium and Heavy Trucks
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Hi my name is***** will be glad to try to help. What is your serial number? Check for fine metal/debris in the transmission filter and oil indicating a potential internal failure. If clean test power in and out of the shift controller in all gear positions for power to the shift solenoids. Let me know the serial number so I can be sure to get you the correct information for your serial number machine
Thanks for the info. Click here for the schematics to help testing the shift circuit.
Second page towards the bottom left of the schematic