Photo - Primary ARB Air Locker AMC Model 20
AMC 20 selectable air locker and components arranged on a white background
29 spline AMC Model 20 locker components exploded diagram on a white background
AMC 20 air locker differential on a white background
Off-road AMC Model 20 traction locker on a white background
Photo - Primary ARB Air Locker AMC Model 20
AMC 20 selectable air locker and components arranged on a white background
29 spline AMC Model 20 locker components exploded diagram on a white background
AMC 20 air locker differential on a white background
Off-road AMC Model 20 traction locker on a white background

ARB AMC Model 20 Selectable Air Locker - 29 Spline

ARBRD187

$1,299.95
/
Shipping calculated at checkout.

The ARB Air Locker Differential for AMC Model 20 uses a pneumatically operated locking system, the lockable differential completely locks the differential when activated, preventing internal gears from rotating independently. This forces both axle shafts to turn together, delivering maximum traction in rocks, mud, snow, and uneven terrain. When switched off, the differential functions like a conventional open unit, making it ideal for mixed street and trail use.

Kit Includes:

  • ARB AMC Model 20 Air Locker Differential
  • Dash activation switch
  • Solenoid valve
  • Air line
  • Bulkhead fitting

Note: Air compressor required for operation (sold separately).

Specifications
  • Differential Type: Selectable Air Locker
  • Axle Type: AMC Model 20
  • Material: Steel
  • Design: Two-piece carrier
  • Activation: Pneumatic (air-operated)

  • Front Axle (IFS – AMC 20)

    • Axle: AMC 20 (8.875")
    • Position: Front
    • Spline: 29
    • Shaft Diameter: 1.25"
    • Gear Ratios Supported:
    • 2.73 & Down
    • 3.08 & Up

    Rear Axle (IRS – AMC 20)

    • Axle: AMC 20 (8.875")
    • Position: Rear
    • Spline: 29
    • Shaft Diameter: 1.25"
    • Gear Ratios Supported:
    • 2.73 & Down
    • 3.08 & Up

    Rear Axle (Model 20 – Solid Axle)

    • Axle: AMC Model 20
    • Position: Rear
    • Spline: 29
    • Shaft Diameter: 1.25"
    • Gear Ratios Supported:
    • 2.73 & Down

    Note: Gear ratio breaks are carrier-specific. Always verify your current ratio before ordering.

Fitment
Make Model Year Range
AM General Hummer 1992–2001
Hummer H1 2002–2006
Jeep CJ5 1976–1983
Jeep CJ7 1976–1986
Jeep J10 1980–1988
Jeep Scrambler 1981–1985
Jeep Wagoneer 1979–1986
Tech Insight

ARB’s patented timed locking mechanism allows ultra fast disengagement under load, reducing driveline stress while maintaining exceptional strength. The two-piece carrier design minimizes internal moving parts for maximum reliability, while the steel is engineered to perform in extreme climates and harsh off-road conditions.

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