AWD vs. 4WD: What's the Difference?

Almost every week somebody standing on our lot asks some version of this question, usually while looking back and forth between a Subaru and a pickup. Here is the short version, and then the longer one.

The short version

All-wheel drive is automatic and always available. Four-wheel drive is something you switch on, and it is stronger when you do.

If your worry is rain, the odd icy morning, and a gravel driveway, all-wheel drive is almost certainly what you want. If your worry is a muddy field, a boat ramp, or pulling a trailer up something steep, four-wheel drive earns its keep.

What all-wheel drive actually does

An AWD system sends power to all four wheels all the time, or it sits mostly in front-wheel drive and shunts power rearward the instant a wheel starts to slip. You do not push a button. You do not think about it. A computer notices the slip before you do and quietly deals with it.

That makes AWD very good at the thing most drivers actually need: not losing grip on a wet on-ramp, or pulling away from a stop sign on a slick morning. It is the reason so many crossovers and wagons offer it.

The trade-off is strength. Most AWD systems are built around lighter components and are not designed for sustained abuse — deep mud, rock crawling, or dragging something heavy out of a ditch.

What four-wheel drive actually does

A traditional 4WD system uses a transfer case to lock the front and rear axles together so they turn at the same speed. That gives you real mechanical grip, and most trucks also offer a low range that multiplies torque for slow, heavy work.

The catch is that locked axles do not want to turn corners on dry pavement. The wheels on the inside and outside of a turn need to travel at different speeds, and with 4WD engaged they cannot. That is why your owner's manual tells you to leave it in two-wheel drive on dry roads, and why 4WD trucks have a switch in the first place.

Plenty of modern trucks now offer an "auto" 4WD setting that behaves much more like AWD in normal driving. That is a genuinely useful middle ground.

What this means on the Plateau

Most of the year, neither one is doing much. Most of what you drive here is paved and the weather is mild. Where it matters is a handful of icy mornings each winter, the occasional heavy downpour, and whatever your particular driveway or job site throws at you.

Our honest advice: buy the drivetrain that matches the worst ten days of your year, not the best three hundred. And whichever you choose, remember that tires do more for winter grip than any drivetrain. A four-wheel-drive truck on worn tires will out-slide an all-wheel-drive wagon on good ones every time.

Still not sure?

Tell us how you actually use a vehicle — the commute, the trailer, the driveway — and we will point you at the right column of the lot. It is a two-minute conversation and it saves a lot of second-guessing later.