We tested all three locking differentials of the Mercedes-Benz AMG G 63 4x4 Squared, and they bailed us out of some mucky situations.
during development, it was never formally announced. There’s no official spec sheet. It’s not even listed on Mercedes-Benz’s website. This thing is a ghost, yet I spent nearly a week in a matte-gold Mercedes-Benz G 63 4x4 Squared. It’s real. It’s outrageously expensive. It’s wonderful.
The latest 4x4 Squared uses the AMG G 63’s twin-turbo 4.0-liter V-8 that churns out 577 hp and 627 lb-ft of torque, which is up 161 hp and 177 lb-ft over the G 550 4x4 Squared that used a version of the same engine. Boost is a hell of a drug. It’s hooked to a 9-speed automatic transmission, up two gears from the previous 7-speed, and a full-time four-wheel-drive system with three locking differentials. The rear, front, and center differentials are each engaged with a button on the dashboard.
Every hill, rut, and valley that the yellow Rivian conquered in silence, the 4x4 Squared followed with a low burble. About an hour into our adventure toward the heavens, the G 63 4x4 Squared finally blinked. Going up an undulation with the center and rear lockers engaged, the driver-side front tire started to spin. I tapped the left-most silver differential button to engage the front locker. I felt a click, eased into the throttle, the front wheels grabbed at the dusty, slippery, rock-strewn earth, and the burbling SUV began to move forward as if the undulations didn’t exist.
Mercedes estimates the G 63 4x4 Squared can sprint from 0-60 mph in about 5.0 seconds, and my butt dyno estimates that’s about right, if not quicker. That’s on the way to an electronically limited 130-mph top speed. It requires some trip planning, though, especially for parking, because the high-riding Mercedes requires 88 inches of clearance, meaning it won’t fit in all parking garages or through all drive-thrus.
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