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Get instant traction and unlock your 4x4’s off-road potential with a TJM Pro Locker.

The TJM pro locker is the result of extensive research and testing in Australia and the USA's most challenging off-road conditions.


Instant traction.

The TJM Pro Locker is a highly advanced differential lock. With the flick of a switch, a TJM Pro Locker sends compressed air to engage a lock ring that links the carrier and the side gears, resulting in equal drive to both axles. The ability to lock a differential gives you instant traction in places or conditions you would otherwise have none, giving your 4x4 far more off-road potential.

Every TJM Pro Locker is designed and manufactured to ensure peak performance when you need it most, empowering you to go further and take on four-wheel drive challenges with confidence.

Unprecedented strength.

Constructed from high-grade SG iron with larger pinion gears and longer ring gear bolts, the TJM Pro Locker is the pinnacle of strength. This strength translates to ultra-reliable performance and durability on the track, allowing you to consistently conquer off-road obstacles with ease.

Air on demand.

Activate your TJM Pro Lockers instantly with a TJM air compressor. The TJM Pro Locker Compressor is a compact solution that’s designed to work exclusively with your TJM Pro Locker, while the TJM HD Vehicle Mount Compressor is a multi-functional compressor that can activate your lockers, inflate your tires and perform a variety of other tasks.

How does a diff locker work?

When a vehicle with four-wheel drive engaged is driven in a straight line, the standard differentials in most vehicles allow equal transfer of engine torque to all four wheels. When the vehicle turns a corner, torque is delivered to the wheels that experience the least resistance. This principle ensures that the inside wheels will rotate freely and power is delivered to the outside wheel to prevent the tires from scuffing and wearing out prematurely.

Because the standard differentials transfer the torque to the wheels that encounter the least resistance, you will lose drive on loose/slippery ground or if one wheel is suspended in mid-air. This becomes a problem as the wheel will spin and won’t allow the wheel on firmer ground to drive the vehicle out of a situation. The operation of the TJM Pro Locker differential is simple and straight forward. Utilizing compressed air, the internal selector ring will engage the lock ring. Once the TJM Pro Locker is engaged it forms a solid link between the carrier and the side gears. The differential is now locked and will deliver equal drive to both wheels. The wheel that was once suspended in mid-air can now have equal power delivered to the wheel on firmer ground and can be driven out of the situation.

Unlocking the differential involves the pressurized air being redirected through an exhaust port on the solenoid valve. The spring and the actuator pushes the selector ring back, which in turn pulls the locking ring back out of engagement with the side gear. The differential is now unlocked, and the gears are free to differentiate as before.