Skip to product information
1 of 14

ARB

ARB RD166 Air Locker Differential for 99-24 F-250/F-350 Dana 60HD 35-Spline

Regular price
$1,399.95
Regular price
$1,399.95
Sale price
$1,399.95
Shipping calculated at checkout.

In Stock: 8

Orders by 1pm PST ship same business day

Free Shipping w/3-4 Day Delivery

Authorized Dealer

Fitment Guarantee

30-Day Hassle Free Returns


Product Specification:

SKU:ARBRD166

MPN: RD166

UPC: 881348012210

Weight: 41.7 lb

Inventory: 8

Type: Differentials



Vehicle Fitment

  • 1999-2024 Ford F-250 Super Duty (Dana 60HD Front Axle, 35-Spline, 4.56 & Up Gear Ratios)
  • 1999-2024 Ford F-350 Super Duty (Dana 60HD Front Axle, 35-Spline, 4.56 & Up Gear Ratios)

Features

  • Provides 100% traction on demand without affecting on-road drivability
  • Pneumatically operated locking system for instant engagement
  • Two-piece design with minimal moving parts ensures maximum reliability
  • Patented 'timed' locking mechanism offers high strength and ultra-fast unlocking
  • Steel-reinforced, elastomer-bonded annular seal handles extreme temperatures
  • Compatible with ARB air compressors (sold separately)
  • Designed and manufactured in Australia for rugged off-road conditions
  • Backed by ARB's comprehensive 5-year warranty

Specifications

  • Part Number: RD166
  • Axle Type: Dana 60HD
  • Axle Spline Count: 35 Spline (Ø38.1mm / 1.50")
  • Gear Ratio Compatibility: 4.56 and Up
  • Ring Gear ID: 162.0mm (6.38")
  • Ring Gear OD: 248mm (9.75")
  • Ring Gear Bolts: 12 bolts on Ø191mm (7.50") circle
  • Ring Gear Torque Spec: 149Nm (110 ft-lb)
  • Backlash: 0.15-0.25mm (0.006-0.010")
  • Bearing Cap Torque: 108Nm (80 ft-lb)
  • Position: Front Differential
  • Material: High-grade steel
  • Color: Silver
  • Warranty: 5 Years

Included Components

  • 1 x ARB RD166 Air Locker Differential
  • 1 x Activation Switch
  • 1 x Solenoid Valve
  • Air Lines and Bulkhead Fittings
  • Installation Guide and User Manual

Product Description

The ARB RD166 Air Locker Differential is engineered to enhance the off-road capability of your Ford F-250 or F-350 Super Duty equipped with a Dana 60HD front axle and 35-spline shafts. Designed for gear ratios of 4.56 and up, this air locker provides 100% traction on demand, allowing you to tackle challenging terrains with confidence.

When engaged via a dash-mounted switch, the RD166 uses compressed air to lock the differential, ensuring both wheels turn in unison for maximum traction. Its robust two-piece design minimizes moving parts, enhancing reliability and longevity. The patented 'timed' locking mechanism ensures rapid engagement and disengagement, while the steel-reinforced, elastomer-bonded annular seal withstands extreme temperatures and conditions.

Compatible with ARB's air compressor systems (sold separately), the RD166 is a must-have upgrade for off-road enthusiasts seeking improved performance without compromising on-road drivability. Whether navigating rocky trails or slippery slopes, the ARB RD166 Air Locker delivers the traction you need when you need it most.

Photo - Primary
Photo - Primary
Photo - Primary
Photo - Primary
Photo - Close Up
Photo - Unmounted
Photo - out of package
Photo - Unmounted
Photo - Unmounted
Photo - Unmounted
Photo - Unmounted
Logo Image
Logo Image