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That torque is transmitted through a four-speed automatic to all four wheels. An electronically-controlled transfer case proportions the power to the four wheels. The usual torque split is 40/60 percent front/rear, going to 50/50 percent when the transfer case differential is locked. There are five modes for the transfer case to handle everything from highway driving to crossing wet sand to clambering over large rocks. The 4WD system is capable of further reducing the vehicle’s gear ratios for serious obstacle climbing. In a worst-case scenario, the rear axle differential can also be locked. The electronically-controlled throttle adjusts itself according to the 4WD mode, allowing easier power modulation. When it’s time to stop, a Bosch four-channel ABS system stands guard. The ABS can detect and adjust the vehicle’s braking to rough off-road surfaces like gravel and potholes. It also incorporates an electronic traction control system, allowing the vehicle to move forward even if only one wheel has traction. A switch allows the traction control system to be set for sand and desert conditions, allowing more wheel slip. This 2900-kg behemoth uses body-on-ladder-frame construction, with reinforced front and rear sections for winching and vehicle towing. Suspension is by independent front torsion bar and five-link coil spring rear. An optional air suspension system performs automatic load leveling at the rear. The system also allows the driver to increase the rear suspension’s height by 50 mm, and includes an air hose that the driver can pull out manually to inflate each tire in about 5 minutes. Short overhangs allow the H2 to plunge into big holes and climb out again without getting caught. Its mechanicals are tucked higher than the side frame rails to avoid damage by obstacles, and ground clearance for the differential is a high 254 mm. The result is that the H2 can traverse streams of up to 508 mm, clambering over rocks or even up stairs as tall as 406 mm. It can also charge through deep sand, and go on high-speed desert runs. GM is going all-out to promote the Hummer brand in the USA, rolling out new dealerships dedicated to the brand. Some of these dealers even have a severe off-road course in their backyard, so customers can test for themselves what the H2 can do before making a purchase. If they do so, they’ll have to shell out at least USD48800, placing the H2 squarely in the premium SUV range. Rather than introducing a watered-down version of the Hummer, GM has introduced a unique successor, more civilized than the Hummer but every bit as unstoppable. |
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