2008 Hummer H2 Owner's Manual - Page 116
2008 Hummer H2 Manual
Page 116 highlights
SECOND (2): This position reduces vehicle speed without using the brakes. Use SECOND (2) on hills. It can help control your speed as you go down steep mountain roads, but then you may also want to use the brakes off and on. FIRST (1): This position reduces vehicle speed without using the brakes. Use it for major/severe downgrades and off-road driving where the vehicle would otherwise accelerate due to steepness of grade. When you shift to SECOND (2) or FIRST (1) it provides the lowest gear appropriate to your current road speed and continues to downshift as the vehicle slows, eventually downshifting to the selected gear. Your vehicle has a shift stabilization feature that adjusts the transmission shifting to the current driving conditions in order to reduce rapid upshifts and downshifts. This shift stabilization feature is designed to determine, before making an upshift, if the engine will be able to maintain vehicle speed by analyzing things such as vehicle speed, throttle position and vehicle load. If the shift stabilization feature determines that a current vehicle speed cannot be maintained, the transmission does not upshift and instead holds the current gear. In some cases, this may appear to be a delayed shift, however the transmission is operating normally. Your vehicle's transmission uses adaptive shift controls that compares key shift parameters to pre-programmed ideal shifts stored in the transmissions computer. The transmission constantly makes adjustments to improve vehicle performance according to how the vehicle is being used, such as with a heavy load or when temperature changes. During this adaptive shift controls process, shifting may feel different as the transmission determines the best settings. When temperatures are very cold, the Hydra-Matic® 6L80 automatic transmission's gear shifting may be delayed providing more stable shifts until the engine warms up. Shifts may be more noticeable with a cold transmission. This difference in shifting is normal. 2-34
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