2003 GMC Sonoma Owner's Manual - Page 103

Up-Shift Light If you have a manual transmission, you have a SHIFT light. Shift S p e d s SHIFT This light will show you when to shift to the next higher gear for best fuel economy. When this light comes on, you can shift to the next higher gear if weather, road and traffic conditions let you. For the best fuel economy, accelerate slowly and shift when the light comes on. While you accelerate, it is normal for the light to go on and off if you quickly change the position of the accelerator. Ignore the SHIFT light when you downshift. If your vehicle has four-wheel-drive and is equipped with a manual transmission, disregard the SHIFT light when the transfer case is in 4LO. I .. you ~ . - . p gear when you downshift, I )u a could lose control of your vehicle. You could injure yourself or others. Don't shift down more than one gear at a time when you downshift. Four-Wheel Drive If your vehicle has four-wheel-drive, you can send your engine's driving power to all four wheels for extra traction. To get the most satisfaction out of four-wheel-drive, you must be familiar with its operation. Read the part that follows before using four-wheel-drive. See Off-Road Recovery on page 4-1 1. You should use two-wheel high (2HI) for most normal driving conditions. Notice: Driving in the 4-WHEEL HIGH (4HI) or 4-WHEEL LOW (4LO) positions for a long time on dry or wet pavement could shorten the life of your vehicle's drivetrain. 2-28