Yukon Gear 1995-2015 Toyota Tocoma Rear Diff w/ Grizzly Locker 30 Spline & 3.73 Ratio Drop Out Assembly

The Yukon YDAT100-373YGL Dropout Assembly is a fully assembled and pre-adjusted third member for Toyota 8.4″ rear differential setups. It features a 3.73 gear ratio, 30-spline axle compatibility, and a built-in Yukon Grizzly Locker for reliable traction. Just install it into your housing, add gear oil, and drive—no shim or backlash setup required. 

Detailed Specifications

• Gear Ratio: 3.73
• Spline Count: 30 spline axles
• Differential Type: Mechanical Yukon Grizzly Locker
• Case Material: Nodular iron housing
• Dropout Configuration: Complete third member with yoke pre-installed
• Factory Setup: Shims, preload, and backlash pre-adjusted for bolt-in readiness

Compatibility & Fitment

• Intended for Toyota 8.4″ rear axle housings using 30-spline shafts—common in T100, first-gen Tacoma, early Tundra, etc.
• Always verify your rear axle dimensions, spline count, and housing style before ordering.

Advantages of This Assembly

• No User Setup Needed: Shimmed and adjusted at the factory for ease of install.
• Improved Rigidity: Nodular iron resists flex and maintains gear geometry under load.
• Full Locking Capability: Grizzly Locker provides torque to both wheels for traction in tough terrain.

Installation Notes & Cautions

• Follow proper break-in procedures for new gears and locker.
• Use the correct gear oil and fill amount per spec.
• Expect increased tire wear in tight, binded turns due to full locking during torque load.
• Verify bearing fits and housing tolerances prior to install to avoid damage.

Questions? We’re Here to Help.

Have questions about drivetrain upgrades or differential fitment for your truck? Our team at FASS Motorsports is here to assist:

• Phone: 636-429-7020
• Email: info@fassmotorsports.com