Here is what you are looking for. I copied it from another site:
Four modes of 4WD operation are available on the 2006 Hummer H3. Most common is the 4-High Open setting for normal driving. 4-High Locked automatically transfers power to the front or rear wheels as needed, 4-Low Locked is reserved for serious off-road operation, and Neutral allows the Hummer H3 to be flat-towed.
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