ARB Air Locker — Toyota Tacoma Rear (8.4", 30-Spline) | RD129

The ARB RD129 is an air-actuated, driver-selectable locking differential for the Toyota 8.4" axle — 100% mechanical lock on demand, fully open when disengaged.

Technical specifications

• Ring gear: Toyota 8.4"
• Spline: 30
• Shaft diameter: 1.31"
• Ratio range: All ratios
• Material: Forged steel
• Actuation: Pneumatic (air)

Engineering

• Two-piece, ultra-durable design with minimal moving parts for maximum reliability
• Patented, timed pneumatic locking mechanism — high strength with ultra-fast unlocking
• Steel-reinforced, elastomer-bonded annular seal rated for extreme temperatures
• Fully open when disengaged — no effect on on-road drivability or driveline wear
• 5-year warranty

Fitment: Toyota Tacoma Rear. Toyota 8.4" (Tacoma), 30-spline, all ratios. Toyota Tacoma rear.

Ring-gear sizing: Toyota rear differentials quoted as 8.9-inch and 9.5-inch are frequently used synonymously — the meaningful difference between Toyota rear diffs is usually the spline count (27, 30, 32 or 36 spline), not the nominal ring-gear size. Match your axle by spline count / axle code rather than the quoted size before ordering.

In the box: Air Locker differential, dash activation switch, solenoid valve, air line and bulkhead fitting. An ARB air compressor is required to operate (sold separately) — pair with an ARB CKMA12 (single) or CKMTA12 (twin).