ARB RD104 Air Locker – Dana 30, 30 Spline 3.73+

The ARB RD104 Air Locker is a driver-selectable pneumatic locking differential for the Dana 30 application. It locks the differential on demand for off-road traction and allows normal differential operation when disengaged.

Fitment and specifications

• ARB part number RD104
• Axle specification Dana 30
• Axle shaft splines 30
• Ratio 3.73:1 and numerically higher
• Operation Pneumatic, selectable differential lock

This is an axle-specific performance application. Confirm the actual differential and shafts before ordering.

The catalogue image illustrates the ARB Air Locker range. Confirm the exact axle before ordering.

ARB application chart · ARB service and parts manuals

Related equipment

ARB Air Locker Manifold Kit

Frequently asked questions

How do I confirm that RD104 fits my vehicle?

This is an axle-specific performance application. Confirm the actual differential and shafts before ordering.

Does this Air Locker require a compressor?

Yes. Use a compatible onboard air supply. A compressor is purchased separately.

Can I fit it to the front or rear axle?

Use it in the axle position specified for your differential and vehicle. Engage a front locker only off highway.

How do I check the gear ratio?

Check the axle tag or verify the crown-wheel and pinion tooth counts. Confirm the carrier break with your installer.

Do I need a specialist installer?

Differential fitting requires the correct tools, bearing preload and backlash settings. Use a differential or axle specialist.

What information should I send if I am unsure?

Send your vehicle year, axle position, axle identification, spline count and ratio. Include whether the axle is original or has been swapped.