The box can be adjusted and it may be done with the box in the car. There is an adjustment screw on it. I cannot recite the specs of how to set the correct torque off the top of my head, but I am sure you will uncover this info if you do a search.
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record