With our improved two piece design available right across the range, along with the addition of forged gears and an industry leading five year warranty, ARB Air Lockers are now better built and better backed than ever before.


Many people believe that a 4x4 and traction go hand in hand...you can't have one without the other. However, your vehicle's standard (or open) differential is designed to allow each wheel to turn independently, thus eliminating binding during turns. While off road this becomes a major burden as engine power will take the path of least resistance, which occurs at the wheels with little or no traction.

Newer vehicles with limited slip differentials may offer some improvement, but more often you'll find the slipping not 'limited' enough to maintain forward progress. Automatic locking differentials also have their disadvantages. Aside from being noisy when disengaging, they can also upset the on-highway driving characteristics of your vehicle.


Created to provide 100% traction on demand, without sacrificing any of your vehicle's highway driving performance, ARB Air Lockers employ a 12 volt ARB Air Compressor designed to activate (and deactivate) a solid and durable locking mechanism inside the differential. This gives you the traction you need, when you need it, all at the flip of a switch and all within the comfort of the driver's seat.

The advantage of the ARB Air Locker lies in the pneumatically operated locking system inside the differential. When activated, the Air Locker prevents the differential gears from rotating and therefore prevents the axle shafts from turning independently of each other. With both wheels tied directly to the rotation of the ring gear, the vehicle maintains maximum possible traction at all times. When unlocked, it operates just like a conventional 'open' differential.

In addition to providing outright improvements to a 4x4's off road capabilities, the Air Locker offers significant environmental benefits. An Air Locker equipped vehicle can be driven in a slower, safer and more controlled manner, greatly reducing the likelihood of vehicle damage and environmental impact.


ARB Air Lockers are currently available in over 100 configurations to suit a wide range of 4x4 vehicles from around the world and can be installed in both the front and rear axles. Installation should be performed by a qualified differential technician, although no special tools or skills are required apart from those necessary for fitting a standard differential. ARB also offers three compressor models suitable for Air Locker operation, two of which can be used to inflate tires and other equipment such as air tools.


A relentless commitment to research and design, the use of high quality materials and an uncompromising approach to manufacturing have all contributed to Air Locker's success in over 100 countries worldwide. The patented design of the ARB Air Locker is extremely strong, with structural components manufactured from aerospace grades of alloy steel.

Recent developments have seen forged gears and an improved two piece design add increased strength and durability, while reducing the amount of moving parts to ensure precision amongst components and a much firmer and responsive activation. These additions have also resulted in increased load bearing capabilities.

The design process of an Air Locker involves countless hours of testing. Computerised Finite Element Analysis (FEA) allows the engineer to subject each Air Locker design to 'virtual' off road driving stress simulations much more extreme than those experienced in real life, including extreme temperatures and harsh wheel-spin. Prototypes are tested to ensure the strength of the Air Locker exceeds that of the axles or other driveline components. Finally, field testing is carried out with units being fitted to 4x4s that operated in the harshest environments imaginable.

Once this exhaustive design phase is complete, ARB Air Lockers are manufactured in Australia by ARB and sold throughout the world.

For peace of mind, all ARB Air Lockers are backed by an industry leading five year warranty.


  • 1. Differential Case

    Fully machined one piece nodular iron differential carrier case offers the rigidity of a one piece factory differential with twice the standard number of pinion gears to cope with the torque.

  • 2. Flange Cap Assembly

    Fully machined nodular iron flange cap incorporates the stationary side of ARB’s tough, proven and patented timed locking mechanism.

  • 3. Splined Side Gear

    Forged gears and redefined tooth geometry, ARB's revolutionary design yields structural advantages of up to 30% over other available high strength gears.

  • 4. Pinion Gear

    Forged gears and redefined tooth geometry, ARB's revolutionary design yields structural advantages of up to 30% over other available high strength gears.

  • 5. Clutch Gear

    ARB’s patented locking system actually supports the side gear teeth, giving you more torque handling exactly when you need it.

  • 6. Spider Block

    A billet machined alloy steel spider block supports the cross shafts, using the torque applied at each shaft to support the next shaft along.

  • 7. Long Cross Shaft

    Alloy steels and performance surface technology make for a high pressure running fit that can handle an enormous amount of punishment.

  • 8. Cross Shaft Retaining Pin

    Custom made one piece hardened retaining pins lock into the assembly using a tapered thread junction.

  • 9. Bonded Seal

    Steel reinforced, elastomer bonded annular seal has been proven to handle 20,000+ cycles under the most extreme climactic temperatures on earth.

  • 10. Return Springs

    To engage/disengage the locker, ARB Air Lockers use up to 12 return springs to support the entire profile of the locking gear for a fast, positive and independent disengagement.

  • 11. Air Supply

    At the flick of a dash mounted switch, compressed air is delivered to a seal housing assembly via a nylon air line.

  • 12. Solenoid Valve

    Manufactured from a machined and anodized billet aluminum and sealed against moisture and dust to IP54 standards, ARB's heavy duty solenoid controls the air actuation.

Please note - some technical features may differ between models.


  • Provides 100% traction on demand without affecting on road drivability or driveline wear
  • Vastly improved traction means less reliance on momentum, which reduces the likelihood of vehicle damage and environmental impact
  • Easy, convenient operation allows the user to concentrate on the terrain without leaving the comfort and safety of the driver’s seat
  • Ultra durable and extremely strong - only the highest quality materials used in construction
  • Incredibly simple yet effective design that employs minimal moving parts, thereby ensuring maximum reliability
  • Thoroughly tested and proven design – trusted and used in over 80 countries around the world
  • Front and rear Air Lockers available for most makes and models
  • 4WD & 2WD applications
  • Easy installation and maintenance – no special tools, skills or additives required
  • Manufactured in Australia

    ARB Air Lockers are manufactured at ARB's state of the art factory in Melbourne, Australia.

  • 5 Year Warranty

    ARB Air Lockers come with an industry leading 5 year warranty.

  • Forged Gears

    Forged gears provide superior strength and durability.

  • 2 Piece Design

    Patented gearing technology that ensures optimal locking strength is attained every time the ARB Air Locker is activated.

Competition Air Lockers Rock Crawling


Of the many ARB products seen in off road competition, it's the one you can't see that makes the difference - ARB Air Locker diff locks continue to dominate the world's toughest off road events.

ARB Air Lockers are used in extreme off road competitions the world over. Our commitment to research, development, design and production means ARB Air Lockers set the benchmark for quality and reliability - two things crucial to competition use. So if you need traction you can rely on, rely on ARB Air Lockers....the world's best already do.


  • King of the Hammers
  • Ultra4 Series
  • Baja 1000/500
  • Mexico 500
  • W.E.Rock Dirt Riot
  • W.E.Rock Rock Crawl
  • Outback Challenge
  • USA Extreme Rock Crawling Series
  • Tuff Truck Challenge


ARB Air Lockers are available for the vast majority of 4x4 vehicles from around the world. In addition, a number of high performance models are available for specialist applications such as drag racing, competition rock crawling and heavy tank-track type snow equipment.

Designing locking differentials for applications such as these presented our engineering team with some significant challenges. Not only must the locker be able to withstand more traction torque than a standard differential, but it must also tolerate massive amounts of torque handling facilitated by the substitution of custom made high alloy aftermarket axle shafts, which are cut with larger than standard diameter splines. This is particularly difficult owing to size constraints dictated by the original axle assembly. ARB met this challenge using a combination of aerospace grade materials, and a design guided by the results of high torque testing using computer simulations and destructive testing.

  • Jeep Air Locker

    An ARB Air Locker suited to the 35 spline Ford nine inch differential. This is widely used in competition rock crawling and drag racing around the world.

  • 2005 USA 'DirtSport Driver of the Year' Shannon Campbell believes Air Lockers are one of the keys to his success. The 2 time winner of the world's premier rock crawling event, the UROC, states that "anybody not using ARB Air Lockers is just spinning their wheels."

  • Different rock-face, different continent, different competition, same traction aid... Air Lockers in action at Australia's Outback Challenge.

  • Air Lockers keep your 4WD moving, even in the knee deep mud of the Malaysian Rainforest Challenge.


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