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The two styles are not interchangeable I dont know exactly why not though. The m939
and m939a1 use a ross hydrapower box. The a2 trucks use a different brand.
There are 2 different style gearboxes. If the lines hooked up different chances are he installed the wrong one. M939 and a1 use one style and the a2 trucks use a different one. They are not interchangeable.