Jeep's 4.0L six is a great engine in stock form. Chad improved it by installing an Edge throttle body on a Hesco throttle body spacer breathing through a K&N cold air intake. Torque tube headers scavenge the exhaust. Flex-A-Lite's 3300 cfm electric fan helps the mill keep its cool. Currie motor mounts raise the engine 1 inch, allowing a better rear driveline angle. An Optima Yellow Top sealed battery doesn't leak and a Quick Air 3 compressor supplies air for the ARB and inflating tires. Behind the engine, a Jeep 32RH three-speed automatic tranny sports a deep Currie pan and is cooled by a large RV cooler.