Yukon Gear 2005-2015 Toyota Tacoma Rear Diff w/ Grizzly Locker 30 Spline & 4.30 Ratio Drop Out Assembly

The Yukon YDAT100-430YGL Dropout Assembly is a complete, pre-assembled third member designed for Toyota 8.4″ rear differentials using 30-spline axles. With a 4.30 gear ratio and an integrated mechanical Grizzly Locker, this unit arrives pre-adjusted and ready to install—just bolt it in, add fluid, and hit the road. 

Technical Specifications

• Gear Ratio: 4.30
• Spline Count: 30 spline
• Differential: Mechanical Grizzly Locker
• Housing Material: Nodular iron, for improved rigidity and heat resistance
• Dropout Type: Complete third member with yoke pre-installed
• Factory Setup: Shims, preload, and backlash set at the factory — no setup required on your end

Fitment / Compatibility

• Intended for Toyota 8.4″ rear differential housings with 30-spline axle shafts.
• Often used in T100, older Tacomas, and early Tundra models—verify your current rear end before ordering.

Benefits & Use Cases

• Install-Ready: Comes pre-adjusted so you bypass complex differential setup.
• Stronger Construction: Nodular iron case maintains gear alignment under stress.
• Maximum Traction: Grizzly Locker locks both wheels under torque, enhancing off-road and low-traction performance.

Notes & Best Practices

• Follow break-in procedures for new ring & pinion units.
• Use the correct type and amount of gear oil as recommended by Yukon or Toyota specs.
• Expect slightly heavier turn feel and increased tire wear on hard turns due to full locking behavior.
• Confirm axle housing, bearing fits, and differential clearances before installation.

Questions? We’re Here to Help.

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

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