4WD hill climbs and descents: line, gears and what to do when it goes wrong

To drive a steep hill safely in a 4WD, walk it first, pick a line that keeps the vehicle as level as possible, select low range and an appropriate gear before you start, and use smooth, steady momentum rather than speed. On descents, point straight down the slope in low first and let engine braking do the work. If a climb fails, reverse straight back down under control; never try to turn around on a steep slope.

Hills cause many serious 4WD incidents, especially rollovers. This guide is general information and does not replace practical training. It is part of our 4WD beginner's guide.

Before the hill: stop and look

The most important decision is made before you drive. Stop at the bottom (or top), get out and look. Walk the hill if you cannot see all of it. Check:

• Surface: loose rock, clay, shale, sand or wet ground
• Ruts and washouts: depth and whether they cross the track
• Steps and ledges: that could lift a wheel or catch the underbody
• The crest: what is on the other side, such as a drop, a turn or oncoming traffic
• A safe run-out: somewhere to stop if things go wrong

If the track is wet, consider whether you should drive it at all. Wet clay tracks are easily damaged and many land managers close them in wet weather. Check with the land manager, such as Parks Victoria for the Victorian High Country.

Set up the vehicle

• Tyre pressures: lowered appropriately for the surface. See tyre pressures.
• Low range: engaged before the climb. See using low range and diff locks.
• Lockers: engaged before the obstacle if you expect wheels to lift, not halfway up.
• Load: secured. Heavy items should be low and forward; loose items become projectiles.
• Passengers: consider getting them out to spot and to reduce weight.

Choosing a line

The best line keeps all four wheels in contact with the ground and the vehicle as level side to side as possible. In practice:

• Go straight up the fall line where you can. Climbing at an angle increases the risk of a rollover.
• Straddle ruts rather than dropping wheels into them, where it is safe.
• Avoid crossing deep ruts at an angle, which can lift diagonally opposite wheels.
• Use a spotter for sections where you cannot see your wheels.

Gear and momentum

The aim is steady, controlled momentum, enough to keep moving without wheelspin, but not so much that the vehicle bounces and loses traction.

• In a manual, choose a low-range gear that lets you climb without changing gear mid-hill, often second or third.
• In an automatic, low range drive usually works; some drivers select a manual mode to stop the transmission changing up.
• Wheelspin digs holes and damages tracks. Ease off slightly and let the tyres grip.
• Bouncing usually means too much speed or too high a tyre pressure.

Descents

Descents are often more dangerous than climbs because gravity is working against you.

1. Stop at the top and look.
2. Select low range first gear, or use hill descent control if your vehicle has it.
3. Point straight down the slope.
4. Let engine braking control the speed. Cover the brake and use it gently if needed.
5. Avoid locking the wheels. A sliding vehicle cannot steer. If the rear starts to slide around, a little accelerator can help bring it back in line.
6. Never descend in neutral or with the clutch in.

When a climb fails

If you stall or lose traction near the top, do not panic and do not try to turn around.

1. Hold the vehicle on the foot brake (and handbrake if needed).
2. Restart the engine if it stalled. Many manuals can be restarted in gear with the clutch in; follow your manual.
3. Select reverse in low range.
4. Release the brakes slowly and reverse straight back down, letting engine braking control the speed.
5. Look back over your shoulder and keep the wheels straight.

At the bottom, reassess: lower pressures, a different line, a spotter, or a different route. Repeated attempts damage the track; sometimes the right answer is to turn back.

Side slopes

Driving across a slope (a side slope or off-camber section) carries a real risk of rollover. Avoid it where possible. If you must cross, keep your speed low, keep the uphill wheels on the high side, avoid ruts and bumps on the downhill side, and keep passengers and heavy load on the uphill side. If the vehicle starts to feel unstable, turn downhill.

Know when to turn around

There is no shame in turning around. Good reasons to choose another route include rain making the surface slippery, a climb beyond your vehicle's or your own experience, no other vehicle to help with recovery, and approaching darkness. Members share track conditions in the tracks and parks board — check recent posts before you go.

Where to go next

• Back to the 4WD beginner's guide
• Using low range and diff locks
• Recovery basics and winching
• Victorian High Country
• 4WD FAQ