The engine is mated to a Hydra-Matic 6L80 6-speed automatic transmission. It also features TapShift control, Tow/Haul mode, and Auto Grade Braking. Although big, the Chevrolet Suburban 4WD has a fuel economy of 15 mpg city, 22 mpg highway, and 18 mpg combined. This fuel economy is made possible by the engine’s standard cylinder deactivation How do they work? While an all-wheel drive system does send drive to all four wheels, it has some fundamental differences to a 4WD - both full-time 4x4 and part-time FWD. The most obvious one is the lack of a transfer case and instead drive is directed to each wheel via either a limited slip differential or an electronically-controlled clutch. This is a four-wheel-drive system that can be operated continuously on all surfaces. It powers all 4 wheels at all times. A full-time 4WD system may include the option of part-time operation (allowing you to shift into 2WD on dry pavement, for example) and may or may not have Hi and Lo speed ranges. General Operation. Ford's Intelligent all-wheel drive system is always on and is constantly working in the background as you drive. Every 16 milliseconds the on-board computer system monitors up to 25 different sensor signals, as the computer deems necessary, including the throttle position, individual wheel speed, actual speed, engine load and Be aware that some 4×4 dual battery isolators can allow your starter and secondary batteries to work together, boosting starting power to your vehicle should the starting battery suddenly drop in voltage. This is not the case with all isolators, however. Your auxiliary battery will most likely be a deep cycle battery. . Explorers are rear wheel drive, so normally in 4WD Auto on a normal rode your in 2WD. But say its raining and you hit the gas hard around a turn, the back tires spin. 4WD Auto utilizes the ABS sensors to detect wheel slip, and when it does detect it, the computer engages the front wheels or 4WD High without you doing anything. The system's 4-Low mode locks the front and rear drive shafts for low speed power or towing, while low range provides a 2.92:1 gear reduction for better climbing ability and crawl in off-road While All-Wheel Drive is a more expensive option and uses more parts (more things that can break), there are some huge benefits. These include: Better acceleration: With all four wheels putting power down (usually), gaining speed is easier. More stable acceleration: With the power spread out between two axles there is less wheel-spin and Be aware that some 4×4 dual battery isolators can allow your starter and secondary batteries to work together, boosting starting power to your vehicle should the starting battery suddenly drop in voltage. This is not the case with all isolators, however. Your auxiliary battery will most likely be a deep cycle battery. Turn off Traction Control. A traction-control system can bring the truck to a stop if the tires start spinning when you are trying to move up a snowy hill—that's a normal side effect of traction control. Turn off traction control if possible. If that's not an option, increase your speed to gain momentum, but don't go so fast that you lose

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