1999 GMC Envoy Owner's Manual - Page 186

yellowblue D What's at the bottom of the hill? Is there a hidden CAUTION: Shifting the transfer case to NEUTRAL can cause your vehicle to roll even if the transmission is in PARK (P). This is because the NEUTRAL position on the transfer case overrides the transmission. You or someone else could be injured. If you are going to leave your vehicle, set the parking brake and shift the transmission to PARK (P). But do not shift the transfer case to the NEUTRAL position. Leave the transfer case in a drive gear. creek bank or even a river bottom with large rocks? If you decide you can go down a hill safely, then try to keep your vehicle headed straight down, and use a low gear. This way, engine drag can help your brakes and they won't have to do all the work. Descend slowly, keeping your vehicle under control at all times. CAUTION: Heavy braking when going down a hill can cause your brakes to overheat and fade. This could cause loss of control and a serious accident. Apply the brakes lightly when descending a hill and use a low gear to keep vehicle speed under control. Driving Downhill When off-roading takes you downhill, you'll want to consider a number of things: D How steep is the downhill? Will I be able to maintain vehicle control? Q: A: Are there some things I should not do when driving down a hill? Yes! These are important because if you ignore them you could lose control and have a serious accident. D What's the surface like? Smooth? Rough? Slippery? Hard-packed dirt? Gravel? D Are there hidden surface obstacles? Ruts? Logs? Boulders? 4-22