ARB Air Locker RD271 – rear differential for Toyota 8.15", 12-bolt axles

A modern Toyota copes surprisingly well – right up to the moment a rear wheel hangs over a ledge. The factory traction control then tries to brake the spinning wheel, but it does so with a delay and at the cost of momentum. On a steep climb, losing momentum ends the attempt.

The ARB Air Locker RD271 replaces the rear differential carrier in the axle with an 8.15-inch, 12-bolt, shim-adjusted ring gear. You engage it from a dash switch whenever you want – including on the move – and switch it off as soon as the obstacle is behind you.

Key features

• Pneumatic actuation – the locker engages in a fraction of a second at the flick of a dash switch and stays locked until you switch it off. You do not have to slow down or stop to engage it.
• Fully open differential when unlocked – the vehicle drives exactly as it did from the factory, so the Air Locker can stay fitted year-round.
• Two-piece nodular iron case – a rigid housing that holds ring and pinion geometry under load.
• Four forged, hardened gears instead of the factory cast parts – more tooth contact area carrying the torque.
• ARB's patented timed gear design and high-temperature seals – repeatable operation even with hot diff oil.
• Ratio independent – this part number covers all final drive ratios in the applicable axle.

Fitment

Per the ARB Air Locker application chart, RD271 suits the rear axle with an 8.15", 12-bolt, shim-adjusted ring gear:

• Toyota Land Cruiser Prado 250 Series and Lexus GX – 2024 onwards,
• Toyota Tacoma – 2024 onwards.

Earlier Prado generations – 90, 120 and 150 – use different axles: an 8" 10-bolt from 1996 (RD132) and an 8.15" 12-bolt from 2009, covered by RD193. RD271 is not a substitute for those.

Specifications

• Part number: RD271
• ARB axle description: Toyota 8.15" dia. ring gear, 12 bolt, shim adjusted
• Shaft diameter: 33 mm (1.31")
• Shaft spline count: 30
• Ratio coverage: all
• Compatible with the ARB LINX control system

What is in the box

• Air Locker differential (complete carrier with the locking mechanism),
• in-cab activation switch,
• solenoid valve,
• air line with the bulkhead fitting for the axle housing.

An air compressor is not included – the locker needs a compressed air source. If your vehicle does not have one yet, we will match a compressor to the locker.

Installation notes

Important on vehicles with the factory rear locker. ARB warns that on Prado 250 and Tacoma models fitted with the factory locker, the bearing on the differential case side is difficult to remove without damaging it. Order it beforehand as a spare – part number 9036650166, available through ARB or Toyota – so the job does not stall halfway.

Fitting means stripping the axle and re-setting the crown wheel and pinion: backlash and tooth contact pattern, plus running the air line to the axle and wiring the in-cab switch. This is work for a shop experienced with differentials.

We can do the installation – Szekla4x4.pl is an online shop, a walk-in store and a workshop specialising in off-road and overlanding. Get in touch and we will match a compressor and book the job.

Warranty: 5 years with no mileage limit, per ARB's warranty policy.

Frequently asked questions

I already have the factory rear locker – why an Air Locker?

Factory electric lockers usually engage only at very low speed and take a moment to lock. An Air Locker locks instantly and at any speed. If your rear axle is already locked from the factory, the next logical step is a front Air Locker.

Does RD271 fit a Prado 150?

No. From 2009 the Prado 150 uses the 8.15" axle covered by RD193. RD271 applies only to 2024-on vehicles: the Prado 250, Lexus GX and the fourth-generation Tacoma.

Does it change how the vehicle drives on the road?

No, as long as it is switched off – unlocked it works as the factory open differential and the vehicle's electronic systems operate normally.

Do I need a compressor?

Yes. The locker runs on compressed air; the compressor is bought separately and will also air your tyres back up.

Why buy it

• Instant, positive axle lock instead of waiting for the electronics to brake a spinning wheel.
• Less throttle means lower shock loads on shafts and CV joints – and less trail damage.
• Built for the ARB LINX system, so the locker can share one control panel with the rest of your ARB gear.

Want the whole package – locker, compressor and fitting? Message us for a full quote and a workshop slot.