What are some signs of a convertor being too tight? What will the truck do, how will it act when accel? What Would the convertor to stall the truck when going from park to reverse but not stall when going from drive to reverse?
If the clutch in the converter is dragging, it can do what you are descibing.
It could also have a bad sprag in the converter, which locks the impeller, or what ever it is called.
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