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ARB Dana 30 27 Spline Air Locker Differential for 3.54 and Down Gear Ratio (76-18 Jeep CJ5, CJ7, Wrangler YJ, TJ & JK)

Item J101459
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      Video Review & Installation

      The ARB Dana 30 27 Spline Air Locker Differential for 3.54 and down gears is for the 1987 to 2018 YJ through JK owner that's looking to add a ton of additional traction to your Jeep. This is gonna be a pretty involved three out of three wrenches for the installation. You do have to crack open the differential, completely re-setup that differential with the new locker installed and with an air locker you also have to run an onboard air system so some plumbing, some wiring, a little bit of everything involved in this installation and we'll talk a little bit more about that in just a second.So when you are looking to add traction to your Jeep you can look at anything from a positraction or a limited slip differential all the way up to a locker. So a limited slip is going to have really nice on road manners because as it engages it does so really smoothly. It's nice and quiet. There's no banging. There's no additional tire wear. But when you're off-road it's not going to be a true locker. You're not truly going to have full power to both of the tires on that axle because there's a clutch mechanism and there can be some slippage. You can also have to do a little more maintenance to a limited slip differential than you would to a locking differential. When you step up to a locker you're going to find two main categories. One is going to be selectable which is what we're talking about here. The other would be automatic. And as the name says a selectable locker can be turned on and off at the flick of the switch inside the cab of the vehicle where an automatic locker is going to kick on and off as you turn the tires of the Jeep.So an automatic locker as it kicks itself on and off, there can be a little bit of a bang, a little bit of noise and because it is kicking on and off all the time even when you're driving on the road you can have some unnecessary or additional tire wear on your Jeep. And that's why they put a selectable locker really at the top of the pile when it comes to lockers because when you're on the road and you don't need the additional traction hit the switch and it is a completely open differential. No banging, no weird driving in any sort of road conditions, no additional tire wear but when you're off-road and you need that traction, hit the button and you got 100% locked up differential, full power going to both tires, maximum traction to get you out of a sticky situation or over an obstacle.Now the locker we're talking about today is a selectable locker. This is an ARB air locker and if you've been shopping for lockers for a while you have definitely come across the ARB name. They make the air locker out there on the market. This is going to be what's known as the strongest locker that you can get. It's going to be the most reliable locker. You hit the switch it's going to turn on every time. And this thing is really just unbreakable in the vast majority of situations that you're going to be running. So if you do have the budget for it and you're looking for the strongest air locker out there on the market you are definitely looking in the right place.Now I mentioned before that an air locker does have a lot of components to it. So if we were talking about just an automatic locker you wouldn't see any of this stuff. It would just be this center section, just be the locker which essentially replaces the carrier inside the differential. But because we're talking about a pneumatic selectable locker we have all of these other things to consider. So this ring right here, this is where the air actually enters into the differential. This pipe here, that actually gets drilled and threaded through the housing of the differential where on the other end it's going to connect to this hose right here. All of that gets plumbed to this actuator or solenoid which when you put power to it is going to open and allow that air to lock up the differential and when you hit the switch to turn it off will close the solenoid letting the air out of the differential and giving you back your open differential for driving on the street. That on and off is all triggered off of this switch here which has this very nice switch cover that says front air locker right on it. Now that's just everything you get with the locker. We talked a lot about air. You need an onboard air system to run something like this. So you're going to be installing a compressor. Most likely a tank. Not necessarily but most likely so there's a lot of other plumbing and a lot of other wiring that is necessary.So why do an air locker versus one of the other types of lockers that you can get that are still selectable? Because you can get an electric selectable locker where you're just running two wires to the differential and a switch on the dash. No air components, no plumbing involved. Or you can get a manual locker where there's actually going to be a cable mechanism that will allow you to engage and disengage the locker. So a lot of options. Why choose air locker? Well, an air locker gives you the ability to have double duty for an onboard air system. So most of us wanna have an onboard air system anyway so that we can air up tires when you are getting off the trail so you can run air tools in a pinch. So if you already have one of those systems or you want to help to rationalize the cost of one of those systems by not just having air tools and airing up tires but also running your lockers this allows you to do that. Now if you have no need, no want for an onboard air system then I'd probably recommend taking a look at one of the other types of selectable lockers out there.Now as I said, this is gonna be a three out of three wrenches for the installation and I think what we just talked about really explains why. There's a lot of plumbing, there's a lot of wiring and aside from the locker there's that whole onboard air system that you need to run in order to feed this thing. To get the actual locker installed in the differential you're completely stripping out the differential. You are completely resetting it up. All your measurements, your backlash, all of your preloads, all that stuff needs to be reset which can require some specialty tools as well as some specialty knowledge to ensure that you're not going to end up with a differential that makes a lot of noise or could be wearing out prematurely. So the vast majority of you are going to send your Jeep to a shop to have them install the locker for you and there is absolutely no shame in that. That's probably a good idea. Again for the majority of you guys out there.Now as far as the cost goes I mentioned before that this is probably the best locker that you can find on the market or at least it is held in very high regard by a lot of people that have put these through so much torture. Really big tires, really hard wheeling and they just keep ticking. So if that's what you're after, you would expect to pay a little bit of a premium price and this is going to have that price tag. This comes in at right around $1,000 for this locker and then you also need to add that additional cost of an onboard air system if you don't currently have one or at least the cost of getting that modified so that it'll also run this system here. So certainly not the least expensive option out there on the market but it is going to be one of the strongest ones that you can get for your Jeep.So if that's what you're looking for I would definitely recommend this choice from ARB and you can find it right here at

      Product Information

      Features, Description, Q&A, Specs & Installation


      • Air Locking Differential
      • 100% Traction on Difficult Terrains
      • Designed for Gear Ratios 3.54 & Down
      • 27 Spline
      • Improved Traction
      • Easy Operation
      • Tested and Proven Results
      • Made from Aerospace Grade Steel
      • For Dana 30 Axles
      • Fits 1976-2018 Jeep CJ5, CJ7, Wrangler YJ, TJ and JK Models


      Premium Function. The ARB Airlocker differential provides reliable grip and traction on off-road terrains. It uses an ARB patented pneumatic locking mechanism that locks the differential gears and prevents the axles from moving independently of each other for superior grip when you need it. The Airlocker gives you better control and offers smooth and comfortable navigation and is specifically designed for your Dana 30, 27 spline axle.

      Solid Construction. ARB Air Lockers are constructed from aerospace grade steel for superior performance time and time again.  This locker requires the use of an on board air compressor system to actuate the locker for use. The ARB AirLocker Differential Kit comes with a replacement differential, activation switch, solenoid valve, air line and bulkhead fittings.

      Application. The ARB AirLocker differential Dana 30, 27 spline for 3.54 & higher (numerically lower) gear ratios are designed for 1976-2018 Jeep CJ5, CJ7, Wrangler YJ, TJ and JK Models.

      Fitment: 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018

      ARB RD101

      CA Residents: WARNING: Cancer and Reproductive Harm -

      Installation & What's in the Box

      Installation Info

      What's in the Box

      • (1) Air Locker
      • Hardware

      Tech Specs


      Reviews of ARB Drivetrain Products (97)

      Reviews of ARB Drivetrain products have an average rating of 4.8 out of 5

        Questions & Answers

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