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FAQ & GLOSSARY

Full of questions but short on time? Take a deep breath — we've compiled a list of frequently asked questions so you can spend less time at your computer and more time on the trails.

What’s the difference between full-time and part-time 4WD systems?
Full-time systems use a centre differential so the front and rear driveshafts can turn at different speeds, but the part time system locks the driveshafts together. So with a full-time 4WD system you can use 4WD, well, full-time. But with a part-time system, you should switch to 2WD during everyday driving on dry surfaces.
Why can't you use Part-Time 4WD on dry surfaces?
Part-time systems lock the front and rear driveshafts together. But, thanks to our old friend physics, front and rear wheels travel at different speeds when you turn. This is fine on surfaces like sand or snow where the tires can naturally slip to compensate. On dry surfaces, the extra grip can bind the driveline (causing “Crow Hop”), and cause unnecessary wear on parts.
Why does "Crow Hop" occur?
When you turn your Jeep®, each wheel travels different distances at different speeds. If the axles are locked together, the difference in speed can bind the driveline. When one of the tires loses traction, the wheel slips, the tension is released with a bang or shudder, and the car “hops”.
Can I shift into 4WD High-Range at any speed?
You can shift into 4WD High-Range when you’re stationary or driving up to 55mph (88km/h).
How long can I drive in 4WD High-Range?
In a full-time system you don’t need to switch mode. In a part-time system, only drive in 4WD high-range if the road is wet, loose, or slippery – switch to 2WD as soon as the conditions improve.
How fast can I drive in 4WD High Range?
As fast as the road conditions allow.
What is 4WD Low-Range?
This mode is for temporary use on tricky terrain or when you need extra pulling power. The vehicle locks the front and rear driveshafts together and the power is sent through extra gears for more torque. It isn’t suitable for everyday driving. Unless your everyday is pulling boats up slipways.
Can I shift into 4WD Low-Range at any speed?
Only up to 3mph (5km/h). Shift into neutral, or press the clutch. Then while you’re coasting, shift the transfer case lever through neutral and into low-range. Then go back into gear.
How fast can I drive in 4WD Low-Range?
Up to 25mph (40km/h).
Can I shift into 4WD Low-Range when stopped?
It’s possible but difficult because the teeth of the gears might not be aligned. The best method is to coast in neutral at 3mph (5km/h), shift into low-range, then go back into gear.
What if I never use the Selec-Terrain® switch?
That’s why we added an Auto mode. Forget about switches and enjoy the adventure. You can thank us later.
Does the vehicle need to be parked or moving to operate the Quadra-Lift® suspension or Selec-Terrain® system?
Either. You can adjust the height of the Quadra-Lift® system manually or have the Jeep® decide for you. If you change the systems while driving, remember that height settings have speed thresholds. You can only enter Park mode below 12mph, and the system kicks in below 6mph. Off-road heights have limits to keep your ride comfortable.

Select a term to view its definition.

Approach Angle
The angle of slope you can approach (from flat ground) without scraping the front undercarriage. If the car has a short front overhang, it will have a high angle of approach, so you can tackle bigger obstacles like boulders.
Articulation
Flexibility. To tackle challenging obstacles you need the tires to stay on the ground. The better the articulation, the easier it is for the tires to stay down and give you traction.
Axle Articulation
The ability of one axle to move relative to the chassis. It is the measure of the ease with which tires stay in contact with the ground (and retain traction) on very uneven terrain.
Axle Differential
A gear system in the middle of the axle. It lets the wheels spin at different speeds when you turn.
Axle
A solid piece of metal connect the wheels together. The suspension is also attached to the axle.
Brake Traction Control System
If a wheel starts to slip, this moves torque from one wheel to the other on the axle.
Breakover Angle
The degree of slope you can go over without needing a big repair job on your frame
Center Differential — Geared
Gears inside the transfer case on full-time 4WDs. It distributes torque to each driveshaft and lets wheels rotate at different speeds to avoid Crow Hop.
Clutch Plates
Alternating plates in the transfer case of many 4WD systems. One set is splined to each driveshaft. The housing is filled with a silicone-type fluid that clings to the discs to help transfer torque.
Coil Springs
Coil springs are big factor in making your journey more comfortable. They support the weight of the vehicle and allow the wheels to move up and down when you drive over bumps.
Continuously Variable Transaxle
A stepless transmission that uses a sheave clutch to transmit engine torque.
Crawl Ratio
The final drive ratio in low range is essential for serious off-road treks. You can “creep” along (without your foot on the accelerator) at very low speeds and the Jeep does all the work for you. Crawl ratio = first gear ratio x rear axle ratio x low-range 4WD ratio. The higher this number is, the better your Jeep’s off-road capability, and the more extreme the adventure.
Crow Hop
When the vehicle shudders and the tires slip because the driveline is bound. This usually happens if you use basic 4WD or part-time 4WD on dry pavement.
Departure Angle
When you return to flat ground from a slope, this is the maximum angle before you scrape the rear undercarriage.
Differential
A gear system that transmits torque to the drive wheels. It also allows the wheels to spin at different speeds when you turn. 4WDs have differentials in the front and rear axles.
Driveshaft
A shaft connecting the transmission output shaft to the differential drive pinion shaft. 4Wds have a second driveshaft from the transfer case to the front differential.
Electronically-Controlled Coupling
Automatically manages the torque split from front to rear for a smooth ride without you doing anything.
Fixed Yoke Output Assembly
Handles the extra output from the transfer case for smooth driveline performance.
Four-Wheel Drive
When engine power is distributed between the front and rear axles to drive all four wheels. Full-time 4WD uses a centre differential so the front and rear driveshafts can turn at different speeds. A part-time system doesn’t use a centre differential so in normal driving conditions you need to use two-wheel drive.
Front Axle Disconnect
A 4WD component to connect and disconnect torque to the front axle. If you shift to 2WD, the front axle is removed from the driveline to reduce wear, noise, and fuel consumption.
Ground Clearance
The amount of space between the bottom of your Jeep and the ground. We carefully design approach, departure, and breakover angles so you can easily conquer any obstacle in your path.
High-Range
A 4WD mode for on-road or light-off road use.
Hill Descent Control
A system for smooth and controlled descent down a slope without you needing to brake. Your Jeep will use the antilock brake system to slow you down to the right speed.
Jounce/Rebound
The movement of the wheel’s suspension. Jounce is compression, and rebound is the opposite.
Limited-Slip Differential
Like axle differential but if a wheel spins on a slippery surface, this will automatically transfer torque to the opposite wheel.
Locking Differential
Locks the axle shafts together to give extra traction. Should only be used on slick surfaces, not dry paved roads.
Low-Range
4WD mode for serious off-road conditions
Manoeuvrability
Your Jeep’s ability to navigate narrow gaps, dodge emergency situations, and avoid cosmetic damage.
Neutral
A shifter position where the front and rear axles spin freely. Use it to tow your Jeep or to shift into 4WD low.
Open-Center Differential
A component in the transfer case of some full-time 4WDs. Like an open differential in the axles but more compact. It uses a planetary gearset with gears that revolve around the sun gear and inside the ring gear.
Shift-on-the-Fly
The ability to shift from 2WD to 4WD while you’re moving
Skid Plate
A plate to protect the undercarriage while you’re driving off-road
Solid Axle/Coil Springs
Instead of each wheel having independent suspension, this connects the suspension of two wheels. The springs allow you to travel up and down over tricky off-road terrain.
Suspension Travel
The amount of movement between full jounce and rebound of your suspension.
Tow Hooks
Forged steel hooks at either end of your Jeep for attaching winch cables
Traction
The 4x4 equivalent of grip. Good traction helps you conquer any terrain from muddy bogs to steep mountain trails.
Transfer Case
The transfer case transmits power to the front and rear driveshafts and offers high and low range.
Transmission
A mechanism to transfer torque into driving power through gear sets.
Two-Wheel Drive
When the front axle spins freely while power is sent to the rear axle to drive the vehicle.
Viscous Coupling
A device to sense wheel slip and transmit torque to either the front or rear driveshaft to compensate.
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