The G63 AMG 6×6 gets a twin-turbocharged 5.5-liter V8 with 536 hp. Torque is a solid 560 lb-ft and is crucial in providing the shove required to haul the truck’s 8,322-pound curb weight. Another significant change is the adoption of Mercedes-Benz’s 7G-tronic seven-speed automatic transmission in place of the old NAG1 five-speed automatic used on the military version. The truck has a transfer case capable of channeling drive between a 0.87:1 high-range ratio for on-road driving and 2.16:1 low-range ratio for off-road conditions to all six wheels in a nominal 30:40:30 split. The power take-off for the rear-most axle is by way of an extra drive shaft. There are five electronic differential locks offering 100 percent lockup of all six wheels, operated by three switches on the dashboard. At the ends of each axle are the massive 37-inch wheels featuring a bead-plate design. They are shod with 12.5-inch-wide wheels. At 231.3 inches long, 83.1 inches wide and 87.0 inches tall, the G63 AMG 6×6 is 43.5 inches longer, 8.9 inches wider and 10.7 inches taller than the G63 AMG SUV. Ground clearance is a whopping 18.1 inches while the fording depth is 39.3 inches — some 9.8 inches and 15.7 inches more than its standard sibling. At the same time, the approach and departure angles have been increased by 16 degrees and 27 degrees at 52 degrees and 54 degrees, respectively, while the breakover angle has increased by 1 degree at 22 degrees.