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The transfer case for the Hummer is a NP242 variety. It is a durable unit, having a magnesium case and multiple modes of drive, from 4WD low locked, neutral, 4WD high part time, and 2WD or 4WD high. The NP242 case for Hummers can be found in applications such as the Hummer H1until 2006 and the H2 from 2003 to 2009.