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Differential Lockers – Controlled Traction for Every Terrain
Differential Lockers deliver predictable grip by forcing both wheels on an axle to turn together. Choose selectable (air or electric) lockers for on-demand control, or automatic lockers for set-and-forget traction. Pair with appropriate ring & pinion ratios and robust CV shafts to build a dependable driveline.
In this section: Browse all categories • Differential Lockers – Quick Comparison • How to Choose the Right Setup • Related Sections • FAQ
Locker Types
- Selectable Air Lockers: On-demand engagement using compressed air for maximum control.
- Selectable Electric Lockers: Switch-controlled activation without airline routing.
- Automatic Lockers: Mechanical/self-locking units that engage under wheel-speed difference.
Differential Lockers – Quick Comparison
| Type | Purpose | Key Benefits | Considerations |
|---|---|---|---|
| Selectable Air | On-demand traction | Open-diff manners on-road, full lock off-road | Needs compressor & air actuator |
| Selectable Electric | On-demand traction | No airlines; simple switching | Electrical routing & sealing |
| Automatic | Set-and-forget | Always ready, no wiring/air | Can affect tight on-road manoeuvres |
How to Choose the Right Setup
- Driving mix: Daily road + off-road use favours selectable lockers; dedicated trail rigs can consider automatic.
- Axle priority: Start with the rear for climbs and towing; add front later for technical terrain.
- Support systems: Ensure air actuator/compressor (air lockers) or reliable wiring (e-lockers).
- Gearing & strength: If running larger tyres, review ratios and upgrade CVs where needed.
Example: Overlanding with 33–35" tyres? Fit a rear selectable locker first for controlled climbs and towing stability, then add a front locker for slow technical sections.
Fitment & Compatibility Guide
- Carrier & spline count: Match locker model to axle carrier, spline count and ratio range.
- Air/electrical routing: Protect lines/looms from heat, pinch points and water.
- Break-in & fluids: Use the correct oil; avoid friction modifiers if specified by the locker brand.
- Calibration: Verify switch logic and tell-tales for safe operation.
Upgrade Sequence Roadmap
| Stage | Focus Area | Why It Matters |
|---|---|---|
| 1 | Service & Inspection | Confirm axle bearing/seal health before installation. |
| 2 | Rear Locker | Biggest traction gain with balanced on-road manners. |
| 3 | Front Locker | Enhanced control for technical climbing and ruts. |
| 4 | Support Systems | Compressor or wiring, plus dash switches and indicators. |
Related Sections
Frequently Asked Questions
- Are selectable lockers better for daily driving?
- Yes. They behave like an open differential on-road and lock only when you need traction off-road.
- Do I need a compressor for air lockers?
- Yes. Air lockers require an onboard compressor and reliable air actuator/airline setup.
- Will an automatic locker affect handling?
- Some driveline noise or binding can occur in tight, low-speed turns. Many users adapt quickly; selectable lockers avoid this.
- Which axle should I lock first?
- Most builds start with the rear for stability and climbing; the front locker is added for advanced terrain.
- Do you ship lockers across Europe?
- Yes. OFM4x4 supplies and ships differential lockers throughout the UK and Europe, with local stock options for faster delivery.
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