2001 GMC Safari Owner's Manual - Page 211

The Tow/Haul Mode is most effective when the vehicle and trailer combined weight is at least 75% of the Gross Vehicle Weight Rating (GVWR) and the maximum trailer weight rating for the vehicle. See "Gross Vehicle Weight Rating" and "Trailer Weight" in the Index. The Tow/Haul Mode for hauling a heavy trailer is most useful under the following conditions: Weight of the Trailer How heavy can a trailer safely be? It depends on how you plan to use your rig. For example, speed, altitude, road grades, outside temperature and how much your vehicle is used to pull a trailer are all important. And, it can also depend on any special equipment that you have on your vehicle. The following chart shows how much your trailer can weigh, based upon your vehicle model and options. Vehicle Axle Ratio Max. Trailer Wt. 5,400 lbs. (2 452 kg) 5,900 lbs. (2 679 kg) 5,000 lbs. (2 270 kg) 5,500 lbs. (2 497 kg) 5,100 lbs. (2 315 kg) 5,600 lbs. (2 542 kg) 4,700 lbs. (2 134 kg) 5,200 lbs. (2 361 kg) D When driving through hilly terrain at speeds below 55 mph (88 km/h). D When driving in low speed or stop and go traffic below 55 mph (88 km/h). D When driving in parking lots. Use the Tow/Haul Mode instead of the previous recommendation to shift to THIRD (3) gear to improve fuel economy at highway speeds and shift performance at lower speeds. Operating in the Tow/Haul Mode when not pulling a heavy trailer will not cause damage to the vehicle, but you may experience reduced fuel economy and undesirable performance from the engine and transmission. The Tow/Haul Mode should be used only when pulling a heavy trailer. Two-Wheel Drive 3.42 3.73 (Cargo) Two-Wheel Drive 3.42 3.73 (Passenger) All-Wheel Drive (Cargo) All-Wheel Drive (Passenger) 3.42 3.73 3.42 3.73 4-33