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Alright, here is some more parts that may be missing off a M939 / M939A2 truck when you get. Here are the replacements. The rear brake relay valve was about $15 if I recall. I can't remember at the moment the price for the belt. In any case they are comon truck parts. Here they are...

Here is another one for you. This time it is the FAN ACTUATOR VALVE. These are becoming harder to come by. Only one surplus dealer had one. This one however was purchased from a fan speciality place named Superior Turbo and Injection located in Detroit, MI. The actuator is made by EVANS, one of...

Alright, here is another part number out there for something that is always missing, cut wires, or just broke when you get a M939A2 project. It is the Fuel cut-off solenoid. BE CAREFUL, there is one out there that is part number 3921978 that is identical to part number 3921980 (the correct...

M939A2 Filter/Part Numbers Crossover For all you M939A2 guys out there, Here is a quick reference for filter numbers when it comes time to change you filters. Here are the pics with the filter numbers for the oil filter, fuel filter, and tranny filter.