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

The Yukon YDAT100-488YGL Dropout Assembly is a complete, ready-to-install third member for Toyota 8.4″ rear axles (T100/Tacoma/Tundra applications using 30-spline shafts). Built and pre-set by Yukon technicians, it arrives fully shimmed and backlashed to spec, upgraded with a mechanical Yukon Grizzly Locker for maximum traction. Just bolt the third member into your housing, add gear oil, and go.

Key Features & What’s Included

• Complete Dropout (Third Member) Assembly — Professionally shimmed and backlashed at the factory for a true bolt-in install. 
• Gear Ratio: 4.88 
• Spline Count: 30-spline axle compatibility 
• Differential: Yukon Grizzly Locker (mechanical locker) for positive, on-demand traction. 
• Case: Heavy-duty nodular iron housing for added rigidity and consistent gear contact under load. 
• Yoke Included — Ships with yoke installed. 

Fitment

• Designed for Toyota 8.4″ rear differential applications that use 30-spline axles (commonly T100 and select Tacoma/Tundra models—verify your axle). 

Why Choose a Yukon Pre-Built Dropout?

• Time Saver: No setup guesswork—factory-set backlash and preload speeds installation. 
• Stronger by Design: Nodular iron case limits deflection to help gears run quieter and last longer. 
• Trail-Ready Traction: Grizzly Locker sends torque to both wheels when you need it most. 

Availability & Notes

• Part Number: YDAT100-488YGL 
• After installation, fill with the correct gear oil and follow standard break-in procedures for new gears/locker.
• California Proposition 65 warning may apply.

Questions? We’re Here to Help.

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

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