2010 Hummer H3 Owner's Manual - Page 230

9-46 Driving and Operating Shift Speeds Drive Systems Four-Wheel Drive Full-Time Four-Wheel Drive sends engine power to all four wheels for extra traction. To get the most out of Full-Time Four-Wheel Drive, you must be familiar with its operation. { WARNING If you skip a gear when you downshift, you could lose control of the vehicle. You could injure yourself or others. Do not shift down more than one gear at a time when you downshift. 4 m (Four-Wheel High): This setting is used for driving in most street and highway situations. You can also use this setting for light or variable off-road conditions. N (Neutral): Shift the transfer case to Neutral only when towing the vehicle. See Driving Characteristics and Towing Tips on page 9‑70 for more information. Notice: Driving on pavement in Four-Wheel High Lock or Four Wheel Low Lock for extended periods may cause premature wear on the vehicle powertrain and tires. Do not drive in Four-Wheel High Lock or Four-Wheel Low Lock on pavement for extended periods. 4 m Q (Four-Wheel-High Lock): Use this setting when you need extra traction in most off-road situations such as sand, mud, snow or level, rocky trails. Transfer Case Buttons Hill Start Assist H3 and H3T vehicles have a Hill Start Assist feature, which may be useful when stopped on a grade. See Braking on page 9‑3 for more information. The transfer case buttons are located to the right of the instrument panel cluster. Use these switches to shift into and out of the different Full-Time Four-Wheel Drive modes.