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The Mercedes-AMG G 63 is frequently discussed through its exhaust note, cabin trim and street presence. Yet the generation introduced to the US for 2019 retained a serious collection of off-road hardware. Understanding that equipment is useful even if a prospective owner’s usual route ends at a restaurant rather than a trailhead. It explains what the vehicle is built to do and why its controls deserve proper instruction.
This guide concerns the 2019–24 US-market generation. Later updates have different systems and operating details, so their specifications should not be casually substituted when evaluating an earlier vehicle.
Low range changes the gearing
The 2019 Mercedes-AMG launch information describes a transfer case with a 2.93:1 low-range reduction, compared with the preceding model’s 2.1:1. Low range increases torque multiplication at the wheels and permits slower movement for a given engine speed. It serves a different purpose from selecting a more aggressive on-road drive mode.
That distinction is fundamental. A transmission mode can alter shift behavior and throttle response, while a reduction gear changes the mechanical relationship between engine speed and wheel speed. One cannot be treated as a substitute for the other simply because both are selected electronically.
For an owner, the useful next step is a demonstration following the exact vehicle manual. Engagement conditions, indicators and system limitations matter more than memorizing a ratio. A sales walkaround should establish that the controls work and that the driver understands their intended setting.
Three locks answer a traction problem
The G 63 has locking functions for the center, rear and front differentials. In ordinary cornering, differences in wheel speed are necessary. On suitable loose or uneven terrain, a locking function can help prevent available drive from being lost through a wheel or axle with less traction.
Mercedes’ 2021 US reference guide lists the three locks, rear-biased 40:60 all-wheel-drive distribution and the AMG-specific Sand, Rock and Trail modes. It also records the 577-hp, 627-lb-ft twin-turbo V8 and nine-speed transmission. Those are separate elements of one system, rather than multiple ways of saying the vehicle has all-wheel drive.
The powerful engine does not remove the importance of wheel placement, surface conditions or driver judgment. Hardware offers capability within an operating envelope; it does not identify a safe route or guarantee that a crossing is suitable.
The suspension combines old and new ideas
This generation pairs independent double-wishbone front suspension with a rigid rear axle. The arrangement is one of the major technical distinctions from the previous G-Class. The front design changes wheel control and packaging while the rear retains a different architecture, making the vehicle more interesting than a simple description of either “traditional” or “modern” suggests.
For an evaluation, include ordinary uneven pavement and low-speed maneuvers. The resulting observations are relevant to daily use and require no improvised off-road test. Inspecting tire specification is equally important, because a large wheel diameter alone says little about suitability for a particular surface.
Respect the operating limits
The US owner’s manual warns against differential-lock use on firm, high-traction surfaces and explains that certain driving-safety systems are deactivated when locks are engaged. These are consequential limits, not fine print to ignore during a demonstration.
A G 63’s off-road equipment is worth understanding even for an urban owner. It distinguishes the vehicle’s engineering from its image, while making clear that responsible capability starts with the correct instructions, suitable tires and an honest assessment of the conditions.
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