[37 truck]

I have not seen a diagram for the 37 but the 35-36 is close. The difference in function is minor. The 37 lock shaft has a key way cut in it that a pin from opposite the tumbler is pushed up into. The ignition switch is held in the locked position by a small pin that when the steering lock is unlocked moves relative to the switch to free up the switch handle. These pins wear or shear off and you end up with a switch that always works. I just dismantled mine and replaced the pin.