Overview
The ARB Izuzu IFS 17 Spline Air Locking Differential, part number RD203, is a pneumatic selectable locker for an Isuzu rear axle with 17 splines. It uses air to lock both axles together, turning an open differential into a full spool that supplies power to both wheels.
The locker keeps power flowing to both wheels through rough terrain. It needs an ARB onboard air compressor to operate. The compressor is not included.
Key features
- Pneumatic selectable locker that converts an open differential to a full spool
- Supplies 100 percent of the power to both wheels when locked
- 17 spline axle
- Rear axle location
Locker types and the air system
Air-operated selectable lockers are a common upgrade for an open differential, since the driver can engage the lock only when needed and keep normal steering on pavement. A locker that turns the differential into a full spool changes how the axle behaves in tight turns, so many owners use it mainly on off-road routes. Choosing a locker starts with matching the axle type and spline count.
The air system needs a compressor, a switch and air lines, and those parts are usually bought together. Keep air lines routed away from heat and moving parts, and check fittings for leaks. Inspect axle seals and fluid levels during locker work, because the internal parts sit in differential oil.
- Check air lines and fittings for leaks
- Confirm the axle spline count before ordering
- Inspect axle seals during locker installation
Specifications
| Brand | ARB 4×4 Accessories |
|---|---|
| Part number | ARBRD203 |
| Axle location | Rear |
| Axle type | Isuzu |
| Axle spline | 17 splines |
| Differential type | Selectable locker |
| Air supply | ARB onboard air compressor, not included |
Vehicle fitment
It is a universal fit for an Isuzu rear axle with 17 splines. Verify your axle type, year and trim before you order.
Match the Isuzu axle type and the 17 spline count to your axle before buying.
Installation notes
The locker is activated by air from an ARB onboard air compressor, which must be fitted to the vehicle. Plan the air line and compressor layout before starting the install.
What’s included
Only the locker is included. Check the package contents against your installation before starting, since the compressor is not included.
