Adjusting the box is the easy part...allan key and a wrench....loosen the locknut with the wrench, turn the screw with the allan key COUNTERCLOCKWISE in small increments. Too tight will shorten the life of the box.
Getting to the box on a 560 is another thing altogether. I have not done it but have heard of guys removing the exhaust manifold and various other parts to access. Maybe someone else can chime in here....
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