sorry for necro-ing a post, but the wiring that plugs into the rear diff motor is already there? When I lifted the cab on mine, I couldn't find a connector or anything that looked like it plugged into the diff if it had the HD package. I really want to install a locking rear diff and I already checked what ECU would fit, but I'm worried about having to do the wiring to plug on the diff motor itself.
Any info on this? Will I have to run more wires from the diff ECU to the rear diff itself?