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Jeep Project CJ-7

An ongoing Budgeted Rebuild/Build up of a Rock
Crawling Machine.

Offroaders Guide to Gearing up for Offroad
From Basic Equipment to Well Equipped.  An extensive list guide to help you prepare your vehicle for the offroad.

Trailering Safety and Trailer Hitch Information

Off-Road Truck Driving Techniques and Safety

25 Top To Do Tips Before Going Offroad


Got Pop-ups
Spyware & Viruses? feels your pain. Let our Geeks help you...


Rausch Creek
Off-Road Park


Jeep Central
From Jeep History to Tech Specs and Projects.  This section is all about Jeeps.
Jeep Technical Info
Engine Swaps

Installing 23,000 Volt Offroad Lights

Onboard Air
Converting a York
AC Compressor
to Pump Air

What are HID Lights?

Onboard Air
Converting a York
AC Compressor
to Pump Air

Warn 9500i Winch Installation

Warn X8000i
Winch Installation


HEI Ignition
Installation & Review

Lockers, Limited Slips &
other Differentials Explained




Wheeling in the Valley of the Ferns

1.jpg (70086 bytes)
Tellico North Carolina

Paragon Adventure Park
Rock Krawl

Thousands more photos here..»





ARB Air Locker - Lockers
Lockers, Limited Slips, Differentials
and the sport  of Offroading.

An Overview of Standard Carriers, Positraction & Limited Slips,
Locking Differentials, Spools and Mini-Spools



ARB Air Locker - On-Command Lockers

ARB Air LockerWith ARB Air Lockers you have the benefits of both an open differential and a spool at the flip of a switch.  The ARB Air Locker System is a pneumatic locking differential that uses a dash mounted electric switch to activate a vacuum diaphragm which engages the locker.  The ARB Air Locker uses a small charge of air from an on board air compressor that in turn activates the locker.  When activated, both axle shafts are locked together into the equivalent of a spool providing 100% equal traction to both wheels of that axle with no differential of speed between the wheels of that axle.  When the ARB Air Locker is not activated, the ARB axle differential operates as an open differential, providing the smooth, predictable handling characteristics for daily driving.  It is for this reason that ARB and the ARB Air Locker has been credited for introducing a true user friendly, on-demand, dual purpose locker to the offroad community and practical 4x4's could be built, wheeled hard on the weekend and driven daily on the commute to work.

The fact that the ARB Air Locker is only engaged when needed, means it can be installed in BOTH front and rear axles applications.  In addition the front ARB locker and rear ARB locker are each controlled with individual switches to engage/disengage them independently.  This gives more flexibility and control in situations offroad.

ARB provides a variety of 12-volt or 24-volt air compressors that can be used for not just the ARB Air Lockers but also to provide air for supply tanks to power tools or air up tires back to highway pressures after a day on the trails.  Air that supplies the ARB lockers can alternatively come from other onboard compressors so long as they provide 95 to 115 lbs. of air pressure.

When the ARB Air Locker System is purchased (ARB pump and the ARB differential), all of the parts needed are in the kit including the wiring, pneumatic fittings and components, switches, etc.

The ARB Air Locker engages in less than a second and can be engaged at any vehicle speed as long as the axle shafts are spinning at equal speeds with no differential of speed between the wheels of that axle.

The ARB Air Locker is currently available in over 100 configurations to suit a wide range of 4x4 axles applications and vehicles including AMC, Chrysler, Dana, Ford, General Motors, Hummer, Isuzu, Land Cruiser, Mitsubishi, Nissian, Range Rover, Suzuki and Toyota.

ARB Air Locker - Lockers, Limited Slips, Differentials Explained

How the ARB Air Locker works:

The ARB Air Locker is an air actuated locking differential.  From inside the cab of the vehicle, a dash mounted electric switch triggers a 12-volt air solenoid to send air down a  pneumatic air line to the axle housing and into the ARB Air Locker differential.  The air travels into the differential through a specially designed seal housing.  Compressed air enters the piston chamber and actuates a piston and clutch gear, moving the gear into the locked position.  In the locked position the side gear is locked to the differential housing eliminating any differential action and providing a 100% traction lock-up between the axle shafts making it essentially a spool.

Disengaging the ARB differential is as simple as toggling the dash mounted switch again, which triggers a 12-volt air solenoid to release the air pressure.  This in turn allows the piston springs to return the pistons and clutch gear back to it's original open position.  Now the ARB differential is in a fully open carrier position.  The transition between open to locked or locked back to open occurs in only a fraction of a second.  

ARB Air Locker - Lockers, Limited Slips, Differentials Explained



ARB Air Locker Installation

ARB Locker Compressor Wiring Diagrams

Differential Differences
Overview of Standard Carriers, Positraction & Limited Slips, Locking Differentials, Spools and Mini-Spools


Manufacturers description of the ARB Air Locker:

The ARB Air Locker® System is a pneumatic locking differential that is activated by a dash mounted switch. A small charge of air, from an on board compressor, activates the locker which in turn locks both axles together providing 100% traction. When not activated, the ARB® operates as an open differential and does not have any adverse effect on driving or handling.

ARB Air Locker Features

  • 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

Air Lockers in Competition

For more information on ARB Lockers See below:

ARB Corporation Ltd
42-44 Garden Street
Kilsyth VIC 3137
Tel: +61 3 9761 6622
Fax: +61 3 9761 6807

See their Online Manual Here


ARB Air Locker Articles:

Axle Related Glossary of Terms - Terms and definitions of Axle related components.

The Truth About Air Lockers
Are They Really Too Complicated? Do They Actually Leak? We’ve Got the Lowdown Bonus: Tips for Installation, Common Problems, & How to Reseal  By Craig Perronne - 4Wheel & Off-Road

ARB Air Lockers - ARBUSA

ARB Air Locker Installation

ARB Locker Compressor Wiring Diagrams

ARB Air Locker Online Manual


Jeep Project CJ-7

An ongoing Budgeted Rebuild/Build up of a Rock Crawling Machine.

All Terrain 
Mud Terrain
Tire Reviews & Info

All Terrain
AT Tire Reviews

Mud Terrain
MT Tire Reviews



Ramp Travel Index
RTI / Ramp Travel Index What it is and how to calculate it, with and without the ramp.

Offroad Tire Info
P-Metric Tire Sizes Conversion to Inches
Tire Terminology
Wheel Terminology
How to Pick the Right
Tires for your Truck
Truck Tire Info
Tires - What Hits What Fits
All Terrain  Mud Terrain
Tire Reviews & Info
Mud Terrain MT Tire Reviews
All Terrain AT Tire Reviews
Super Swamper Bogger
Super Swamper SSR
Super Swamper SX
Super Swamper Vortrac
Interco IROK TSL
Super Swamper LTB
Super Swamper TSL
Super Swamper TSL Radial
Super Swamper Narrow
Interco SS-M16 Swamper
Thornbird TSl Radial
Thornbird TSl Bias
Thornbird TSL
Parnelli Jone Dirt Grip
BFGoodrich Krawler
BFGoodrich MT T/A KM
BFGoodrich MT T/A KM2
BFGoodrich AT TA KO
BFGoodrich Mud King XT
Bridgestone Dueler MT
Cooper Discoverer ST
Cooper Discoverer STT
Cooper Discoverer ST/C
Federal Couragia MT
Firestone Destination AT
Firestone Destination MT
General Grabber MT
General Grabber AT2
Green Diamond Icelander
Ground Hawg Mud Tire
Hankook Dynapro MT
Hankook Dynamic MT RT01
Hercules Terra Trac MT
Hercules Trail Digger MT
Kelly-Springfield Safari DTR
Kelly-Springfield Safari MSR
Kumho Road Venture MT
Kumho Road Venture KL71
Kumho Road Venture AT
Dick Cepek Mud Country
Dick Cepek F-C II
Dick Cepek Fun Country II
Dick Cepek Fun Country Nylon
Dick Cepek Fun Country Kevlar
Mastercraft Courser MT
Mastercraft Courser HTR
Mastercraft Courser HTR Plus
Maxxis BigHorn Radial
Maxxis Creepy Crawler
Maxxis Trepador
Maxxis Buckshot Mudder
Maxxis MA-SW
Maxxis M-8080 Mudzilla
Maxxis MT-754 Buckshot
Maxxis MT-753 Bravo
Maxxis MA-751 Bravo
Maxxis MA-S2 Marauder II
Maxxis MA-S1 Marauder
Maxxis MT-762 BigHorn
Nitto Mud Grappler
Nitto Terra Grappler
Nitto Dura Grappler
Nitto Dune Grappler
Nokian Vatiiva MT
Pit Bull Rocker Extreme
Pit Bull Maddog
Pit Bull Growler
Goodyear Wrangler MT/R
Pro Comp Xterrain
Pro Comp All Terrain
Pro Comp Mud Terrain
Pro Comp Xtreme AT
Pro Comp Xtreme MT
Toyo Open Country MT
TrXus Mud Terrain
TrXus STS All Terrain
Michelin LTX A/T˛
Michelin LTX AT2 Press
Michelin LTX AT2
Mickey Thompson MTZ
Mickey Thompson MTX
Mickey Thompson Baja Claw Radial
Mickey Thompson Baja Claw Bias
Mickey Thompson Baja Crusher
Mickey Thompson Baja ATZ Radial SLT
Competition Claw
Dunlop Mud Rover
Federal Couragia M/T
Nitto Dura Grappler
Yokohama Geolandar
Dick Cepek's 2008 F-250 Super Duty Project Vehicle – Project CRUSHER
Mud Tire Reviews
Product Reviews
Tire Reviews
ATV Tire Index
Carlisle 489 Titan
Dunlop Quadmax
Dunlop Quadmax Sport
Quadmax Sport Development
Highlifter Outlaw
ITP Holeshot
ITP Holeshot MX
ITP Holeshot ATR
ITP Holeshot XC
ITP Holeshot XCR
ITP Holeshot MXR
ITP Holeshot XCT
ITP Mud Lite
ITP Mud Lite XTR
ITP Sandstar
Kenda K538 Executioner
Tubeless Bearclaw K299
Kenda Klaw K532
Kenda Klaw K533
Kenda K534 Sand Gecko
Maxxis M961/M962 Mud Bug
Maxxis Rooster Paddle Tire
Maxxis M917/M918 Bighorn
Maxxis M966 Mudzilla
Super Swamper TSL ATV
Super Swamper TSL Vampire
Super Swamper Vampire EDL
Swamp Lite ATV Tires
ATV Tire Mounting
ATV / Quad Links
Quad Tire Reviews Index


Off-Road Lights
by LightForce Product Review / Installation.
from Off-Road Lights


Jeep Dana 300 TeraLow - 4:1 Gearset for the Dana 300 Transfer Case

Jeep Trans Swap
T-18A Transmission Rebuild & Short Shaft Conversion

Black Diamond Suspension Lift install for CJ-7


From the
Department of Cheap   Tricks and Useful Tips

Ultra-Cool Hand Throttle for Free!

Jeep V8 Swap Tips

The Exploding Clutch

Radiator Protection using 6 bucks worth of material

Cracked Under Pressure - Fixing a smashed fingernail

A Cheap, effective alternative to undercoating

Home-built Saginaw Gearbox Brace for the cost of lunch!

Ammo Box Storage - Mounting Them for Quick Disconnect

Home-built Serious Skid-Plate protection for the Oil Pan for under 20 bucks!