Description
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
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