Another upgrade we chose was a front differential cover from Fab Fours. The Fab Fours cover is fabricated out of 1/4-inch-plate steel, and makes the factory unit look like an origami paper sculpture. We like the fact that it's steel and not cast because we can weld tabs onto the cover to mount our PSC steering ram. Also note the electronically actuated AAM front locking differential. The locker is controlled by simply sending 12 volts to one terminal and grounding a second terminal that activates an electromagnet and pulls a collar together, positively locking the differential so power is delivered to both wheels simultaneously.