Yukon Gear 1995-2015 Toyota Tacoma Rear Diff w/ Grizzly Locker 30 Spline & 3.90 Ratio Drop Out Assembly
Can I pick up my order or have it installed at your shop?
Can I pick up my order or have it installed at your shop?
Absolutely. We offer local pickup on most products and full professional installation at our shop in Washington, MO. Whether you just want to grab your parts or have our techs handle the install, we’ve got you covered. Give us a quick call at 636-429-7020 or message us to schedule a visit — we’ll make sure the parts are ready when you arrive.
How do I know if this part fits my vehicle?
How do I know if this part fits my vehicle?
Unsure if it’ll fit? No problem — that’s what we’re here for. Send us your vehicle’s year, make, and model, and we’ll verify fitment before you order. We can also point you toward compatible upgrades or supporting parts if needed.
What if I need to return a product or it’s defective?
What if I need to return a product or it’s defective?
Most unused items can be returned within 30 days in their original packaging. Some products are covered by a manufacturer’s warranty as well. If something arrives damaged or doesn’t meet your expectations, just let us know — we’ll help you get it replaced, refunded, or repaired. (Tracking updates are also emailed automatically once your order ships.)
What's the lead time on custom or fabricated parts?
What's the lead time on custom or fabricated parts?
Many of our parts are built to order — especially fabricated or performance components. These can take additional time to produce before shipping. Lead times vary by manufacturer and demand, but we’ll always keep you updated along the way. If you’re working on a tight schedule, reach out before ordering at 636-429-7020 and we’ll confirm current availability or estimated ship dates.
Description
Description
The Yukon YDAT100-390YGL Dropout Assembly is a factory-preset third member unit designed for Toyota 8.4″ rear differential housings using 30-spline axles. Its internal gearing is already shimmed and backlashed to spec, so you can install it into your rear housing, add gear oil, and drive. For enhanced off-road traction, this version includes a mechanical Grizzly Locker.
Product Specifications
- Ratio: 3.90
- Spline Count: 30 spline axles
- Locker: Mechanical Yukon Grizzly Locker
- Case Material: Nodular iron, chosen for strength and resistance to flex
- Dropout Type: Complete third member with yoke pre-installed
- Factory Setup: Fully shimmed, preloaded, and backlashed—no assembly work needed on your end
Fitment & Vehicles
- Fits Toyota 8.4″ rear housings using 30-spline axle assemblies—common in T100, older Tacomas, early Tundras, and similar setups
- Confirm your existing axle and housing specs before ordering to avoid misfit
Why This Dropout Stands Out
- Zero Assembly Required: Eliminates the need to shim or set backlash—just insert and bolt it in place
- Strength You Can Rely On: Nodular iron case resists distortion and maintains consistent gear engagement
- Traction on Demand: Grinder-grade Grizzly Locker ensures torque is delivered to both wheels under load
Install Guidelines & Tips
- Use proper gear oil and perform gear break-in steps.
- Tighten housing bolts to spec and verify seal integrity.
- Expect higher tire wear in tight turns due to full locking during torque events.
- Ensure correct bearing and axle shaft compatibility before installation—misfits can damage internals.
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
