Kinda mad sounding but I have a ford PCM fan and the attached module that creates pulses to control the electric fan speed. Would be nice to have this feature in the truck, rather than just using an on/off thermostat control. Does the electrical connection of the LB7 mechanical fan clutch work the same way or is it on/off? By the way the ford fan unit has apparently a 2 speed motor I heard. Why if it is pulse controlled I don't know. Nice thing is if you cut the shroud off the ford fan and just leave the round ring it fits right into the round opening in the Sierra shroud.