The Mercedes-AMG G 63 6x6 or Mercedes-Benz G 63 AMG 6x6 is a SUT manufactured by Mercedes-Benz. An SUT derivative of the six wheel drive Mercedes Geländewagen developed for the Australian Army from 2007, at the time it was the company's largest and second most expensive street-legal offroad vehicle. It was manufactured from 2013 to 2015 by Magna Steyr in Graz, Austria.
Mercedes-AMG G 63 6x6
Twin rear axles on the G 63 AMG 6x6
A portal axle is an off-road vehicle suspension and drive technology where the axle tube or the half-shaft is offset from – usually above – the center of the wheel hub and where driving power is transferred to each wheel via a simple gearbox, built onto each hub. It gives two advantages: ground clearance is increased, particularly beneath the low-slung differential housing of the main axles — and secondly, any hub reduction gearing allows the axle half shafts to drive the same power but at reduced torque. This reduces load on the axle crown wheel and differential.
Pinzgauer portal axle
Simple portal gearbox from a WW2 Volkswagen Type 82 Kübelwagen
1930 Farmall tractor with rear portal axle
1961 Porsche F 108 tractor with rear portal axle