This is most useful when generally smooth and dry surfaces have variable sections, such as when a dry highway includes patches of water or snow, or a paved trail has gravel sections.
Limit your speeds to 55 MPH or less or you may damage the transfer case. At this setting, the wheels turn more slowly than on High, so use Low only at speeds of 40 MPH or less. You would rarely use this setting except when you go on rough terrain. All Rights Reserved. Click to call sales. My Vehicles Listed below are your saved and recently viewed vehicles. My Saved Vehicles. My Recently Viewed Vehicles. Compare Vehicles. Logout You can also view your saved vehicles on other devices.
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Log in to view your saved vehicles. Enter your email. According to How Stuff Works , there are a variety of four-wheel-drive systems. Most of the time, however, when an automaker says a truck has 4WD, this means that it is a part-time system. Vehicles with all-wheel drive can sometimes be called full-time 4WD. But no matter your drivetrain, it all works the same. Your truck has two differentials one between the front wheels and one between the rear , which send torque and power from its transmission to the drive wheels.
Sending this power can allow for better use of traction in different situations. Now, with crossovers and SUVs supplanting sedans as the default choice for everyday transportation, it's common for any given vehicle to sport a quartet of driven wheels. But that doesn't mean all systems are created equal.
Unless you have a fully automatic all-wheel-drive system, there will be at least two drive configurations you can choose to maximize your vehicle's capability in a given situation. If you drive an SUV with an off-road bent, like a Toyota Land Cruiser, then you'll have more complicated choices—high range, low range, locked or unlocked center differential.
Then there are all-wheel-drive vehicles with a two-wheel-drive mode like the Chevy Equinox and trucks and SUVs that offer all of the above. Whether you want four-wheel-drive or all-wheel-drive depends on the situation.
Commuting to work in three inches of sleet? In that case, AWD is the hot setup. Back in the early days of the SUV, four wheel traction meant four-wheel-drive. Most systems these days are AWD , meaning that there's a center differential of some sort that allows the front and rear tires to turn at different speeds. AWD can be used on dry pavement, where four-wheel drive requires a slippery surface so that the front and rear ends can match speed without binding.
Most modern crossovers are AWD and don't offer the option to disengage the system—they just work automatically, as needed, when they detect slip. But even if you have that sort of system, there's something you need to know. If you've got a vehicle that offers two-wheel drive or four-wheel-drive auto, then most of the time you may as well use the 4WD Auto setting. It's fine for dry pavement, so the only advantage of running in 2WD would be some fractional fuel economy benefit—or saving wear on the front-drive system.
Meanwhile, 4WD Auto is handy even if it starts raining—your extra traction will be there, on demand, automatically. That's because it just locks the front and rear end together, which might be useful in some narrow off-road context but isn't doing anything for you on that snowy road.
In fact, I'd rather have the system sending power forward or back as needed most of the time, even off-road.
I had a friend who used to have a lates Jeep Cherokee that was all-wheel-drive so, 4WD Auto and the only time he needed to lock the four-wheel-drive system was when he tried to drive through a pond that made the Jeep look like a primordial creature crawling from the muck.
Without an Auto setting, 4WD High is what you'd use in any situation that's low-traction but relatively high-speed—a dirt road or snowy paved road. Low range used to be common, but these days it's relegated to pickup trucks and SUVs that have serious off-road pretensions.
A Toyota 4Runner would have it, but a Highlander won't. OK, let's say you're venturing off-road—a little beach driving.
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