ARB RD121 Air Locker Selectable Locking Differential

The ARB RD121 Air Locker is a selectable locking differential designed for Toyota 8-inch IFS front differentials with 30-spline axles and gear ratios of 3.73 and numerically lower. With the flick of a switch, this Air Locker provides instant lock at any moment, and its super strong design allows activation at any speed.

How It Works:

When activated, the Air Locker prevents the differential gears from rotating and therefore prevents the axle shafts from turning independently of each other, with both wheels tied directly to the rotation of the ring gear for maximum possible traction. When unlocked, it operates like a conventional open differential. The system employs a 12-volt ARB Air Compressor (sold separately) to activate and deactivate the solid and durable locking mechanism.

Key Features:

• Patented locking system ensures fast, reliable actuation
• Steel-reinforced, elastomer bonded annular seal designed to handle extreme climatic temperatures
• Patented 'timed' locking mechanism offers high strength and ultrafast unlocking
• Patented 2-piece design offers interchangeable side gears to integrate with non-standard axle shaft splines
• Carrier constructed from nodular iron for superior strength
• Heavy-duty solenoid manufactured from machined and anodized billet aluminum, sealed to IP54 standards

Complete Kit Includes:

• Air Locker differential
• Activation switch
• Solenoid valve
• Air line
• Bulkhead fittings

Specifications:

• Application: Toyota 8-inch IFS, 30 spline, 1.31-inch shaft diameter
• Gear ratio compatibility: 3.73 and numerically lower
• Bearing size: 53mm
• Position: Front axle application

An Air Locker equipped vehicle can be driven in a slower, safer and more controlled manner, greatly reducing the likelihood of vehicle damage and environmental impact. Installation should be performed by a qualified differential technician, although no special tools or skills are required apart from those necessary for fitting a standard differential.

Note: Requires ARB air compressor for operation (sold separately). Compatible with ARB mini or high-output air compressor models.