Yukon Gear 1995-2015 Toyota Tacoma Rear Diff w/ Grizzly Locker 30 Spline & 4.56 Ratio Drop Out Assembly

The Yukon YDAT100-456YGL Dropout Assembly is a factory-shimmed, ready-to-install third member for Toyota 8.4″ rear axles (T100/Tacoma/Tundra). It ships with the ring & pinion already setup (4.56 ratio) and includes a Yukon Grizzly Locker to maximize both on-road and off-road traction. Simply drop it in your housing, fill with gear oil, and you’re ready to roll.

Full Product Specs

• Part Number / SKU: YDAT100-456YGL
• Ring & Pinion Ratio: 4.56 ish gearing
• Spline Count: 30 spline axles compatible
• Differential Type: Mechanical Grizzly Locker
• Included Yoke: Yes, pre-installed
• Shimmed & Backlashed: Yes, by Yukon factory techs
• Housing Material: Nodular iron for superior rigidity and strength

Vehicle Fitment

• Designed for Toyota 8.4″ rear differential setups using 30-spline rear axles (common in T100, Tacoma, early Tundra). Verify your housing before ordering.

Why Go with a Yukon Dropout?

• Plug-and-Go Installation: Delivered pre-adjusted—no setting backlash or preload at home.
• Stronger Case: Nodular iron resists flex and helps maintain precise gear tooth geometry under load.
• Locking Capability: Yukon’s Grizzly Locker provides full locking traction when needed and unlocks in turns.

Notes & Install Advice

• Ensure proper fluid fill and break-in steps after installation.
• Torque housing bolts to spec and re-check after first heat cycles.
• Because locker locks both sides under torque, expect increased tire wear in tight turns.
• Confirm compatibility with brake gear, axle housing, and bearing setup before ordering.

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