TRE4x4 Lockers UK – Air vs Crab vs Electric Guide

Published by OFM4x4 UK • Updated 20 September 2025 • ~10 min read

If you drive a Land Rover, Toyota Land Cruiser, Nissan Patrol or Suzuki Jimny, you already know how important traction is on muddy lanes, wet grass or steep climbs. A differential locker transforms off-road performance by forcing both wheels on an axle to rotate at the same speed. This improves grip where open differentials would leave you spinning. In this guide, we compare the TRE4x4 Air Locker, the TRE4x4 Crab Locker and the TRE4x4 Electric Locker – three proven solutions designed for UK off-roaders.

Why differential lockers matter in UK off-roading

British off-road driving often means mud, clay, chalk and wet grass. Even modern traction control systems struggle in these conditions. A locker ensures both wheels keep turning, so you maintain forward motion instead of bogging down. Whether greenlaning in the Peaks, towing on farmland, or tackling pay-and-play sites, a locker is one of the best upgrades you can fit.

Brands like ARB made lockers famous, but TRE4x4 lockers offer robust performance at a more accessible price point, with proven reliability across Europe and the UK.

TRE4x4 Air Locker

The TRE4x4 Air Locker uses compressed air to engage or disengage the lock. It is the most versatile solution, ideal for both daily-driven 4x4s and hardcore off-road rigs.

How it works: Uses onboard compressor to push an air piston, locking the differential.
Best for: Land Rover Defenders, Toyota Land Cruisers and Patrols running mixed-use setups.
Pros: Instant engagement, strong locking force, proven design.
Cons: Requires compressor install; more plumbing than electric systems.

Shop now: TRE4x4 Air Locker (OFM4x4 UK)

TRE4x4 Crab Locker

The TRE4x4 Crab Locker is a unique design that replaces traditional air pistons with a patented mechanism. It provides reliable engagement under load and is well suited to heavy off-road use.

How it works: Uses a “crab claw” style locking system for solid engagement.
Best for: Hard-working Land Cruisers, Patrols and off-road competition vehicles.
Pros: Strongest mechanical engagement, less reliant on air seals, minimal maintenance.
Cons: Slightly slower to disengage compared with the standard air locker.

Shop now: TRE4x4 Crab Locker (OFM4x4 UK)

TRE4x4 Electric Locker

The TRE4x4 Electric Locker eliminates compressors entirely. A simple switch powers the electromagnetic locking mechanism.

How it works: Uses a 12V electric actuator to lock the differential.
Best for: Suzuki Jimny, Defenders and smaller 4x4s where space is limited.
Pros: No air lines, straightforward installation, fast response.
Cons: Electrical connections must be well protected against water and mud.

Shop now: TRE4x4 Electric Locker (OFM4x4 UK)

Side-by-side comparison

Feature	TRE4x4 Air Locker	TRE4x4 Crab Locker	TRE4x4 Electric Locker
Activation	Compressed air (via compressor)	Mechanical crab claw system	12V electric actuator
Ideal vehicles	Land Cruiser, Defender, Patrol	Heavy rigs, competition use	Jimny, Defenders, compact 4x4s
Strength	High	Very High	Medium-High
Installation	Requires compressor	Mechanical fitment, air assist	Simpler wiring, no compressor
Maintenance	Air lines & seals	Minimal	Electrical waterproofing

Which locker is right for you?

Daily driver & weekend greenlanes: Air Locker – balance of strength and convenience.
Heavy towing & expedition rigs: Crab Locker – unmatched strength and reliability.
Compact 4x4s & budget builds: Electric Locker – easy fit, cost-effective.

No matter which you choose, all TRE4x4 lockers deliver traction, safety and control that transform your 4x4 off-road.

FAQs – TRE4x4 Differential Lockers

1. Are TRE4x4 lockers reliable?
Yes. They are built for European off-road conditions and tested in mud, sand and rock environments.

2. Do I need a compressor for the Air Locker?
Yes, a small onboard compressor is required. OFM4x4 UK can supply compatible units.

3. Which locker is easiest to install?
The Electric Locker – no air lines, just wiring and switch installation.

4. Will a locker affect road driving?
No. Lockers are only engaged when needed. On-road you drive as normal.

5. Can I fit a locker to both axles?
Yes. Many Land Cruiser and Patrol owners run twin lockers for maximum traction.

6. How do TRE4x4 lockers compare to ARB?
ARB set the standard, but TRE4x4 lockers deliver similar performance at a more affordable price, making them excellent value in the UK market.