2007 GMC Yukon Owner's Manual - Page 144

DRIVE (D): This position is for normal driving. It provides the best fuel economy for your vehicle. If you need more power for passing, and you are: • Going less than about 35 mph (56 km/h), push your accelerator pedal about halfway down. • Going about 35 mph (56 km/h) or more, push the accelerator all the way down. DRIVE (D) can be used when towing a trailer, carrying a heavy load, driving on steep hills or for off-road driving. You may want to shift the transmission to THIRD (3) or, if necessary, a lower gear selection if the transmission shifts too often. Downshifting the transmission in slippery road conditions could result in skidding, see Skidding under Loss of Control on page 355 THIRD (3): This position is also used for normal driving. However, it reduces vehicle speed more than DRIVE (D) without using your brakes. You can use THIRD (3) on hills. It can help control your speed as you go down steep mountain roads, but then you would also want to use your brakes off and on. SECOND (2): This position reduces vehicle speed even more than THIRD (3) without using your brakes. You can use SECOND (2) on hills. It can help control your speed as you go down steep mountain roads, but then you would also want to use your brakes off and on. If you select SECOND (2) and the Tow/Haul has not been selected, the transmission will drive in SECOND (2) gear. You may use this feature for reducing the speed of the rear wheels when you are trying to start your vehicle from a stop on slippery road surfaces. If you select SECOND (2) and the Tow/Haul has also been selected, the transmission operation will be limited to FIRST (1) and SECOND (2) gears. You may use this feature for reducing the speed of the rear wheels when you are trying to start your vehicle from a stop on slippery road surfaces. FIRST (1): This position reduces vehicle speed even more than SECOND (2) without using your brakes. You can use it on very steep hills, or in deep snow or mud. If the shift lever is put in FIRST (1) while the vehicle is moving forward, the transmission will not shift into first gear until the vehicle is going slowly enough. 144