The Eaton eLocker will fit with our Yukon 4.11 Gear Package. As far as tying it into the wiring for the factory rear eLocker, it may be possible, but we can't guarantee it, and personally, I don't recommend it. For one, any engagement of the rear differential will also lock the front regardless of whether or not you're in 4WD, which would put needless wear on the eLocker. Secondly, the factory rear eLocker only stays locked up to 35 mph, regardless of whether you pulled out the knob, while the Eaton unit can stay locked as long as you want as long as the switch is activated.