- Defender 90 - 2002 onwards (rear) 6
- Defender 90 - 2007 onwards (rear with 4 pin rear diff) 6
- Defender 110/130 - 2002 onwards (rear) 6
- Defender 110/130 - 2007 onwards (rear) 6
- Discovery 2 - 2002 onwards (rear) 6
- Range Rover P38 - 1996 - 2002 (front & rear) 5
Shaft Description - Rover type, P38A
Shaft Diameter - 31.5 (1.24")
Splines - 24
Ratio - 3.54
Note - Defender 90 - 2007 onwards is with 4 pin rear diff
Air Locker locking differentials allow you to tackle the toughest terrain.
Ultra durable and extremely strong - only the highest quality materials used in construction. Air Locker locking differentials allow you to tackle the toughest terrain. As the world's premier traction aid, ARB Air Lockers keep you moving in all conditions.
Many people believe that a 4WD 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. 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 is 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 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 flick of a switch, and all within the safety and 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 crown wheel, 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.
> Provides 100% traction on demand without affecting on road driveability or driveline wear
> Vastly improved traction means less reliance on momentum, thus reducing 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
> Easy installation and maintenance - no special tools, skills or additives required
> Two year warranty guarantees the Air Locker will be free of defects in materials
1 If vehicle was manufactured during 1993, check spline count.
2 Air Locker not available for vehicles equipped with high load option.
3 Ring gear spacer required. Longer ring gear bolts (not supplied) are also necessary - (Land Rover part no. 576521).
4 When an DA4191 Air Locker is to be installed in Range Rovers manufactured prior to 1980 (approx.), special carrier bearings (No. K11300/K11162) may also be necessary - Land Rover part no. RTC3426.
5 Some vehicles have crown wheel bolts which cannot be reused and must be replaced. Consult service manual.
6 P38A is most commonly found in traction control equipped vehicles. Identify P38A type diff by large 205mm [8.07"] flange diameter. P38A was not used on North American delivered Discoverys - use DA4193.
Available in the UK only.
Image used for demonstrative purposes only
UK Mainland and International orders are sent via Courier. Most orders are dispatched within 24 hours, and are sent on a next day service (UK Mainland Only), however sometimes it can take 3-5 working days for you to receive your delivery depending on how busy the Courier network is and any shipping disruptions.
Click and Collect is available at no charge to our branches. Customers will be contacted upon completion of their orders and notified that they are now ready for collection.
Douglass Motors offset our carbon emissions produced by all of our deliveries. We are supporting the Pachama project, more details can be found here.
We have a 30-day return policy, which means you have 30 days after receiving your item to request a return.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
To start a return, you can contact us at firstname.lastname@example.org. If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.
You can always contact us for any return question at email@example.com.
Most of our orders are shipped to you by DHL. On orders under £50.00 you will be presented with the option to choose from available couriers who you'd like to pay to have ship your order. In all instances you will be sent tracking information or contact details regarding your shipment.
We aim to get your Douglass Motors order to your door as quickly as possible, typically within 1-3 business days using our standard courier services. Some exceptions apply.
Yes, absolutely! If your order has been lost or damaged in transit then please contact us right away. You can do that here.
Yes! As soon as your item has been dispatched by the team here at Douglass Motors you will receive tracking information by sms and email.
We accept all major Credit and Debit card providers in addition to ApplePay, GPay, ShopPay and Laybuy. Unfortunately, we cannot accept cheques or money orders.
Douglass Motors uses 3D Secure Verification and leading payment partner Stripe to handle all secure payment transactions.
At this time the only alternative payment method supported is Laybuy.
We're sorry to hear you're not 100% satisfied with your Douglass Motors order, to arrange a return simply contact us and we'll guide you through the simple process every step of the way.
We offer a fully furnished returns process, and our shipping partners DHL and TNT will collect your return on our behalf at no cost to you.