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SKU #: ARB-RD139 ARB Air Locker AAM 11.5" 14-Bolt

Purchase ARB Air Locker AAM 11.5" 14-Bolt
    • 2003-2018 5.9L / 6.7L Dodge Cummins 4x4
    • 2001-2013 6.6L GM Duramax 4x4


Have your cake and eat it too. Lock your differential when you need it, but unlock it for factory like driving manners when on the street, only available with an ARB Air Locker. Accepts 3.42 to 5.13 ... read more

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Have your cake and eat it too. Lock your differential when you need it, but unlock it for factory like driving manners when on the street, only available with an ARB Air Locker. Accepts 3.42 to 5.13 Ring and Pinion Gear Ratios

Differential Options
There are three main types of differentials, each with their own advantages and disadvantages open, limited slip, and automatic locking. An open differential is best suited for vehicles used for day to day driving on the street under fair weather. They tend to be the smoothest running differential, but unfortunately they lack the necessary traction capabilities for anything but dry pavement. This is mostly due to the wheels being "disconnected" from one another, which causes only one wheel to spin when traction is most needed. A limited slip differential is a relatively newer concept on modern vehicles which offers traction improvements over an open differential, but typically will still not engage both wheels at the same time when traction is most needed. And finally, an automatic locking differential provides equal traction to both tires all the time, which favors well for off-road use, but will cause increased wear on the vehicle and tires for street use and are typically considerably noisy.

Having Your Cake and Eating It Too
And here is where the ARB Air Locker presents itself as the ultimate differential solution. The advantage of the ARB Air Locker lies in the pneumatically operated locking system inside the differential. When activated by a 12 volt air compressor, 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 conventional "open" differentials. When installed with an ARB air compressor (see below), the locker system is supplied as a complete kit which contains all of the parts necessary for proper installation, including industrial grade control switches, air lines and fittings. ARB offers three compressor models suitable for Air Locker operation. A dedicated air activation system is available which is extremely durable and compact. Alternatively a larger compressor can be specified, which is also perfect for inflating tires, air mattresses and a host of other applications where compressed air is required.

  • 2003-2017 Dodge Ram 2500 w/ Cummins Diesel
  • 2003-2017 Dodge Ram 3500 w/ Cummins Diesel
  • 2001-2013 Chevy Silverado 2500HD w/ Duramax
  • 2001-2013 Chevy Silverado 3500HD w/ Duramax
  • 2001-2013 GMC Sierra 2500HD w/ Duramax
  • 2001-2013 GMC Sierra 3500HD w/ Duramax
  • 2001-2007 Chevy Silverado 2500HD w/ Vortec 8.1L Big Block
  • 2001-2007 Chevy Silverado 3500HD w/ Vortec 8.1L Big Block
  • 2001-2007 GMC Sierra 2500HD w/ Vortec 8.1L Big Block
  • 2001-2007 GMC Sierra 3500HD w/ Vortec 8.1L Big Block


  • SkuARB-RD139
  • ManufacturerARB
  • MPNRD139


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is this good for the front differential as well?

One of the best on the market.


If used on my front differential, will my front driveshaft be engaged 24/7 or spinning so to say? I am trying to make it a free spin so that I do not wear out my front drive shaft and have vibration due to the heavy angle of the drive shaft from the truck lift.?

You would need an actual free spin hub kit for the front then. We have a few available shoot us a call to talk about options.


Have 2004 cumming 5.9L 6speed,stuck in field to many times, limited slip sucks.? Do I install on rear as well as front. The ratio in rear when purchased requested for hyway.?

You can install it on just the rear if you want or front and rear for maximum effectiveness. Those don't come with gears you will have to get new gears or use your old gears.


What is the shipping weight??

I show its listed as 30 LBS for shipping weight. -TL


Will this unit fit the ram 3500 with the aisin transmission and 11.8 rear axles??

Yes that will fit that application just fine. If you are using a different gear set you may need a different bearing kit of course. DppSands


Can you run the yukon 38 spline axles with the ARB air locker??

The ARB Air locker is a 30 spline. So the 38 spline Yukon axles will not work. You would need to run Yukon's Grizzly 38 spline locker (P/N-YUK-DG-YGLGM11.5-38). -Marcus


will this work on a 2019 2500 Ram??

That will depend on what gears you are running on the truck. I would recommend calling in and speaking to a tech. -Ben


Do the front and rear axles use the same locker? 2012 Ram 2500. Which compressor/fittings are needed??

No the front is a AAM 9.25 axle so it will need that locker. Part no# RD197. If you were just using the compressor for the lockers. I would get the ARB-CKSA12. That kit is designed to work with lockers. -Sands


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ARB Air Locker AAM 11.5

ARB Air Locker AAM 11.5" 14-Bolt

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