ARB RD121 Air Locker Toyota 8" IFS 30-Spline 3.73,Ui for 2005-23 Tacoma/4Runner/

Regular price: $1,299.95
Regular price: ~~$1,299.95~~
Sale price: $1,299.95

Shipping calculated at checkout.

In Stock: 10

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:ARBRD121

MPN: RD121

UPC: 881348006905

Weight: 23.7 lb

Inventory: 10

Type: Differentials

Vehicle Fitment

2005-2023 Toyota Tacoma (5th-Gen, 8" IFS, 30-spline, 3.73↓ only)
2003-2023 Toyota 4Runner (TRD, Limited, SR5; front 8" IFS, 30-spline, 3.73↓ only)
2004-2014 Toyota FJ Cruiser (front 8" IFS, 30-spline, 3.73↓ only)
2002-2018 Toyota Land Cruiser Prado 120/150 & Hilux Surf (front 8" IFS, 30-spline, 3.73↓ only)
Front axle only; 53 mm bearing; excludes 4.10+ ratios

Features

Instant 100% traction via pneumatic locker
Activation at any speed; timed unlocking
Rugged two-piece forged-gear carrier
Steel-reinforced elastomer seal for harsh conditions
Includes dash switch, solenoid, air line, bulkhead
Operates open when unlocked - no driveline bind
Front & 4WD/I-FS compatibility
5-year ARB factory warranty

Specifications

Axle: Toyota 8" IFS front; position: front only
Shaft: 1.31" diameter; spline: 30
Gear ratio: 3.73 and down (≤3.73); excludes 4.10+
Bearing: 53 mm
Material: heat-treated steel; color: silver
Weight: approx. 23 lb; dims ~10.6"x10.6"x5.5"

Included Components

1x RD121 Air Locker carrier
1x Dash-mount activation switch
1x Solenoid valve
1x Air line hose
1x Bulkhead fitting

Product Description

The ARB RD121 Air Locker is a front pneumatic locking differential built for the Toyota 8" IFS axle, delivering instant 100% traction when you need it and reverting to open differential as needed. Designed for off-road enthusiasts driving Tacoma, 4Runner, FJ Cruiser, Land Cruiser Prado, and Hilux Surf equipped with 3.73 or numerically lower gear ratios, this locker utilizes a 53 mm bearing and 30-spline shafts.

Installation involves removing the stock front carrier and installing the complete kit - locker carrier, switch, solenoid, hose, and bulkhead. A compatible 12 V ARB compressor is required (sold separately). Please note: this locker fits only 3.73 gear ratios and down (≤3.73); 4.10 and higher ratios are not supported. Fitment is confirmed through 2023, consistent with ARB and Revolution Gear data. Backed by a 5-year ARB warranty, it's engineered for reliable, on-demand traction in demanding terrain.