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. 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! Can anybody explain what the AUTO 4WD does? Does it make the truck perform like an AWD (all wheel drive) vehicle like a Audio for example where there is always power to all 4 wheels, BUT they are not "locked" like in regular 4wd offroad? OR, does it only "kick in" when one of the wheels What is 4WD And How Does It Work? Most cars have traditionally been two-wheel drive, meaning the engine propels two of the wheels and the other two are along for the ride. Usually, the rear wheels receive engine power. Historically, 4WD was mainly used for military vehicles. After World War II, Dodge began offering 4WD as a feature on trucks. 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. For all wheel drive to work when reversing, a vacuum-actuated "throttle control element" is installed on the differential case. This device locks the freewheel mechanism when in reverse gear. The freewheel mechanism unlocks when the gear shift lever is pushed to the right pass the 3rd gear. Four-wheel-drive auto is the default four-wheel-drive mode when sport mode is activated. When to use it : If you’re driving on a road where performance is key, engage sport mode. It tightens up steering, enhances driver feedback, and increases responsiveness to steering wheel inputs to give you a feistier and more fiery drive. Features. +74. Good. 8.0. out of 10. edmunds TESTED. Toyota has gone to great lengths to improve every aspect of the latest Tundra pickup. The turbo V6 and 10-speed automatic deliver a powerful 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 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 3VWo.