If they aren’t AWD or 4WD, vehicles will use either front-wheel drive (FWD), in which the front wheels are powered by the engine, or rear-wheel drive (RWD), where power goes to the rear wheels It's looking like a pretty slick winter so far in Ohio, and I've had no trouble in the past with the 4 auto. I do have to live with a health fear of the mud though. The only time the 4wd has let me down was in my own yard, when the truck slid back down my hill in wet grass. Wouldn't have been a problem at all except it slid back into the trailer. 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 Check my video for how to do this in detail. You will completely bypass the electronics of the 4wd system and apply direct vacuum to your hubs. If you have no leaks in the vacuum lines that go out to your hubs from the solenoid, then the vacuum pump should shut off in under 45 seconds (once it fully pressurizes). 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 it is a bit worse in auto, but not much difference to tell you the truth.. my truck has about 100 g miles on it, so.. no doubt wear is playing a role. I don't like that it does this, but.. in actuality this type of situation is NOT the norm, so once or twice a year, will probably not blow it apart! Driving in 4WD AUTO means automatically switching between 2WD and 4WD whenever the vehicle determines it needs to. For this system to work, your car’s transfer case must have a differential between the front and the rear, which allows the front and rear axle to rotate at different speeds when going around a corner. The hubs have always been auto/lock with ESOF. The MSOS has the "man handle" and manual hubs (get out to engage). For the ESOF system - In auto, the front drivetrain is disengaged at the hub, and at the transfer case. When you select 4wd on the ESOF, it engages the transfer case (no man handle needed) and the hubs. A 4WD Lock locks the rear two wheels of your vehicle together. When the mode is activated, the two wheels cannot move separately from each other. It is used in situations where you expect to lose traction on one side of the road. Most cars these days have 4WD auto, which automatically engages the correct mode for you, so 4WD Lock mode is UIKxvUm.

how does auto 4wd work