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QUALITY 4X4 UPGRADES & ACCESSORIES – SHOP NOW!

TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring

TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
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TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
TRE 4x4 Air Differential Locker — Selectable Diff Air Locker with X-Ring Seal & Wave-Spring
Transform your traction with the TRE 4x4 Air Differential Locker. This heavy-duty locking differential (often called a diff locker or diff air locker) gives you 100% lock on demand, controlled by ... Read More
from
£649.00
Ex Tax: £649.00
  • Stock: Usually in UK/EU Stock
  • Brand: TRE 4x4
  • Weight: 14.00kg
Product Views: 5907

Available Options

All images used are for illustrative purposes only. Individual features such as sizes, fittings, and other materials’ colours may vary. Images are indicative of the quality and style of the specification described and may not represent wholly the actual product in stock. Specifications are not intended to form part of any contract or warranty unless specifically stated.
We want you to be delighted with the products you buy from OFM4x4 UK but, if you do change your mind, you can return your purchase in its original condition within 30 days. For more details, please check our Terms & Conditions.
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Transform your traction with the TRE 4x4 Air Differential Locker. This heavy-duty locking differential (often called a diff locker or diff air locker) gives you 100% lock on demand, controlled by a switch in the cab. Built from forged 4320 alloy with a unique X-Ring four-lobed seal and wave-spring actuation, this selectable locker combines strength, reliability and smooth operation. Whether you’re tackling rutted lanes, muddy climbs, rock steps or snow, the TRE locker keeps both wheels turning together — then unlocks instantly for normal on-road handling. Backed by a 5-year warranty and UK support from OFM4x4.


Key features

  • Selectable diff locker: 100% traction at the flick of a switch, unlocks for normal driving.
  • Forged 4320 alloy case & gears: proven strength for heavy off-road use.
  • X-Ring seal: improved air retention vs. standard O-rings in other pneumatic lockers.
  • Wave-spring design: compact, reliable actuation without deep spring pockets.
  • Pneumatic air locker system: requires on-board air for operation.
  • 5-year warranty: confidence for expedition, work or play.

What’s included

  • TRE 4x4 air differential locker assembly (axle-specific)
  • Bulkhead fitting & nylon airline
  • 12V solenoid valve
  • Dash-mounted switch with wiring pigtail
  • Basic fittings and install hardware

Not included: carrier bearings, shims, oil, or the on-board air compressor. Add a compressor and, for dual lockers, an air manifold.


Technical notes

TypePneumatic, driver-selectable (100% locking differential)
Also known asAir locker, diff locker, diff air locker, selectable locker
MaterialForged 4320 chromium alloy case & gears
Seal systemX-Ring, four-lobed profile
Spring systemWave-spring actuation
Warranty5 years
Air sourceRequired (compressor, switch & plumbing)

Installation & setup

  • Professional install recommended (set carrier preload & backlash correctly).
  • Route air lines carefully; avoid heat and moving parts.
  • Pressure-test lines before final assembly.
  • Pair with on-board air compressors and manifolds for multi-locker setups.

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FAQs

1) What is a diff locker?
A differential locker (or diff air locker) forces both wheels on an axle to rotate together, providing maximum traction in low-grip conditions.

2) Do I need a compressor?
Yes. This is a pneumatic air locker — it requires an on-board air compressor to function.

3) What makes the TRE locker different?
It uses a forged 4320 alloy body, an X-Ring four-lobed seal for better air retention, and a wave-spring for smooth, reliable actuation.

4) Is it road legal?
Yes. When switched off, it behaves like a normal open differential. Engage only off-road or in slippery conditions.

5) What’s the warranty?
The TRE diff locker comes with a 5-year warranty against manufacturing defects.

6) Will it fit my axle?
This listing covers the TRE Air Locker range. Check your axle type or contact us for fitment advice.

7) What’s included in the kit?
The locker, solenoid, airline, dash switch and fittings. Bearings and compressors are sold separately.

8) Is it stronger than stock?
Yes. The forged alloy carrier is significantly stronger than many OEM open diffs, designed for larger tyres and harder use.

Explore related categories: Differential LockersAir CompressorsAir Accessories

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