ARB Air Locker Ford 8.8 31 spline on a white background
Ford 8.8 selectable air locker on a white background
Photo - Primary Rear Ford 8.8 air locker differential
Off-road Ford 8.8 ARB locker on a white background
31 spline Ford 8.8 traction locker assembly on a white background
ARB Air Locker Ford 8.8 31 spline on a white background
Ford 8.8 selectable air locker on a white background
Photo - Primary Rear Ford 8.8 air locker differential
Off-road Ford 8.8 ARB locker on a white background
31 spline Ford 8.8 traction locker assembly on a white background

ARB Ford 8.8" Selectable Air Locker - Rear Axle, 31 Spline

ARBRD81

$1,299.95
/
Shipping calculated at checkout.

The ARB Air Locker Differential is designed to fit 31-spline Ford 8.8" rear axle assemblies across all gear ratios, and allows drivers to move slower, safer, and with greater control, reducing drivetrain shock, vehicle damage, and environmental impact.

Using a pneumatically operated locking system, the Air Locker fully locks the differential when engaged, preventing internal gears from rotating independently. This forces both axle shafts to turn together, ensuring maximum traction in rocks, mud, snow, and steep terrain. When disengaged, it operates as a conventional open differential, providing smooth handling and predictable road manners.

Kit Includes:

  • ARB Ford 8.8" 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: Ford 8.8"
  • Position: Rear
  • Spline Count: 31
  • Shaft Diameter: 1.32 in
  • Gear Ratio Compatibility: All ratios
  • Material: Steel
  • Color: Silver
  • Design: Two-piece carrier
  • Activation: Pneumatic (air-operated)
Fitment
Make Model Year Range
Ford Bronco 1983–1996
Ford Bronco II 1984–1990
Ford E-100 Econoline 1983
Ford E-100 Econoline Club Wagon 1983
Ford E-150 / E-150 Econoline 1983–2014
Ford E-150 Club Wagon / Econoline Club Wagon 1983–2005
Ford E-250 / E-250 Econoline 1983–1998
Ford E-250 Econoline Club Wagon 1983–1991
Ford Expedition 1997–2001
Ford Explorer 1991–2014
Ford Explorer Sport 2001–2003
Ford Explorer Sport Trac 2001–2010
Ford Ranger 1990–2011
Mazda B4000 1994
Mazda Navajo 1991–1994
  • Designed to fit 31-spline Ford 8.8 rear axle assemblies across all gear ratios.
Tech Insight

ARB’s patented timed locking mechanism allows for 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-reinforced, elastomer-bonded annular seal is engineered to perform in extreme temperatures and harsh environments.

Selectable control means traction only when you need it—no compromise on the street, maximum confidence off-road.