Description
The ARB Air Locker Differential (RD132) is a pneumatically activated locking differential designed for the Toyota 8-inch live axle with a 50mm bearing bore, 30-spline shafts measuring 1.31 inches in diameter, and compatibility with all ring-and-pinion ratios. It is available in both front and rear axle configurations and covers select trims across multiple Toyota and Lexus platforms, including the Pickup (1979–1995), 4Runner (1984–2009), Land Cruiser (1990–1997), FJ Cruiser (2007–2009), Tacoma (2016–2023), and Lexus LX450 (1996–1997) — see the fitment section below for the full year-by-year and trim-by-trim breakdown.
IMPORTANT: This differential requires a specific bearing to complete installation. For an 80mm bearing OD, use Timken bearing 32010X (ARB Part Number 160116). For an 83mm bearing OD, use Koyo or SKF bearing TR100802-2 (ARB Part Number 160118). Verify your axle’s bearing OD before ordering. An air compressor is required for operation and is sold separately.
The ARB Air Locker is the world’s premier on-demand traction solution for serious off-road use. Unlike limited-slip differentials or automatic lockers, the Air Locker operates exactly like a conventional open differential during normal driving — with no impact on on-road handling, tire wear, or driveline stress. When traction is needed, a single switch activation locks both axle shafts directly to the ring gear, delivering 100 percent traction to both wheels simultaneously. When unlocked, the unit reverts completely to open differential behavior with no compromise to everyday driveability.
The Air Locker’s advantage lies in its pneumatically operated internal locking mechanism. When the driver activates the system, air pressure engages a locking collar that prevents the differential’s internal gears from rotating independently. This ties both axle shafts directly to the ring gear, eliminating any possibility of wheel spin differential between the two driven wheels. The result is maximum possible torque delivery to both wheels regardless of surface conditions. ARB’s patented timed locking mechanism is engineered for both high engagement strength and ultra-fast unlocking response, so the driver is never caught in a locked state longer than intended.
The RD132 is built from high-strength steel and features a two-piece housing design that minimizes the number of moving parts for maximum long-term reliability. The annular seal is steel-reinforced and elastomer-bonded, engineered to perform across the most extreme temperature ranges encountered in off-road environments worldwide. The Air Locker can be activated at any vehicle speed, giving the driver the flexibility to engage traction control before or during a difficult section without stopping. ARB backs the RD132 with a 5-year warranty.
- Fitment: Toyota 8-inch live axle (front and rear), 30-spline, 1.31-inch shaft diameter, all gear ratios — specific coverage below:
- Toyota Pickup: 1979–1980 (Base, DLX, SR5); 1981–1995 (Base, DLX, SR5 — Gas); 1981–1983 DLX (Diesel); 1983 SR5 (Diesel); 1984 LN56 (Diesel); 1984–1985 DLX (Diesel); 1985 DLX Turbo (Diesel); 1985 RN60; 1985–1988 SR5 Turbo; 1986–1987 (Base Turbo, LN55 DLX Diesel, LN76 Diesel, RN63); 1987 LN67 (Diesel); 1988–1995 (Base, DLX, SR5 — V6); 1993 RN02
- Toyota 4Runner: 1984–1988 (DLX, SR5); 1988–1991 SR5 (V6, 2-door); 1989 DLX (V6, 2-door); 1990–1995 SR5 (V6, 4-door); 1996–2002 (Limited, SR5); 2001 Base; 2003–2009 (Limited, Sport, SR5); 2006–2009 (Limited, Sport, SR5 — V8)
- Toyota Land Cruiser: 1990–1992 Base; 1993–1997 Base
- Toyota FJ Cruiser: 2007 TRD Special Edition; 2007–2009 Base; 2008 Trail Teams Special Edition; 2008–2009 Premium; 2009 Core
- Toyota Tacoma: 2016–2023 (SR, SR5, TRD Off-Road, TRD Sport, Limited); 2016–2022 Edicion Especial; 2017–2022 Sport; 2017–2023 TRD Pro; 2021–2022 (Nightshade, Trail); 2022 Base; 2023 Trail Special Edition
- Lexus LX450: 1996–1997 Base
- Provides 100% locking traction on demand with zero effect on open-differential behavior when unlocked
- Pneumatically activated — engages and disengages with a dash-mounted switch without leaving the driver’s seat
- Can be activated at any speed for maximum versatility on technical terrain
- Patented timed locking mechanism delivers high engagement strength and ultra-fast unlock response
- Two-piece steel construction with minimal moving parts for maximum durability and field reliability
- Steel-reinforced, elastomer-bonded annular seal rated for extreme temperature ranges
- Kit includes: Air Locker differential, activation switch, solenoid valve, air line, and bulkhead fitting
- Air compressor required for operation — sold separately
- Bearing required for installation — 80mm OD: Timken 32010X (ARB #160116); 83mm OD: Koyo or SKF TR100802-2 (ARB #160118)
- 5-year warranty
- Sold individually
| Part Number | RD132 |
| Brand | ARB |
| Color | Silver |
| Material | Steel |
| Axle | Toyota 8-inch live axle |
| Position | Front and Rear |
| Spline Count | 30 |
| Shaft Diameter | 1.31 in |
| Bearing Bore | 50mm |
| Gear Ratio Compatibility | All |
| Bearing Requirement (80mm OD) | Timken 32010X (ARB Part Number 160116) |
| Bearing Requirement (83mm OD) | Koyo or SKF TR100802-2 (ARB Part Number 160118) |
| Activation | Pneumatic (air compressor required, sold separately) |
| Warranty | 5 years |
The ARB RD132 Air Locker is designed for the Toyota 8-inch live axle with a 50mm bearing bore and 30-spline, 1.31-inch diameter shafts, fitting both front and rear axle positions across all gear ratios. Covered vehicles include: Toyota Pickup 1979–1995 (multiple trims, gas and diesel); Toyota 4Runner 1984–2009 (multiple trims, including select V8 models 2006–2009); Toyota Land Cruiser 1990–1997 Base; Toyota FJ Cruiser 2007–2009 (Base, Premium, TRD Special Edition, Trail Teams Special Edition, Core); Toyota Tacoma 2016–2023 (SR, SR5, TRD Off-Road, TRD Sport, TRD Pro, Limited, Sport, Edicion Especial, Nightshade, Trail, and Trail Special Edition); and Lexus LX450 1996–1997 Base. See the fitment bullet above for the full year-by-year and trim-by-trim breakdown. Confirm your axle’s bearing OD (80mm or 83mm) before ordering — see the IMPORTANT note above for required bearing part numbers.