Yukon Gear 1995-2015 Toyota Tocoma Rear Diff w/ Grizzly Locker 30 Spline & 3.73 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 YDAT100-373YGL Dropout Assembly is a fully assembled and pre-adjusted third member for Toyota 8.4″ rear differential setups. It features a 3.73 gear ratio, 30-spline axle compatibility, and a built-in Yukon Grizzly Locker for reliable traction. Just install it into your housing, add gear oil, and drive—no shim or backlash setup required.
Detailed Specifications
- Gear Ratio: 3.73
- Spline Count: 30 spline axles
- Differential Type: Mechanical Yukon Grizzly Locker
- Case Material: Nodular iron housing
- Dropout Configuration: Complete third member with yoke pre-installed
- Factory Setup: Shims, preload, and backlash pre-adjusted for bolt-in readiness
Compatibility & Fitment
- Intended for Toyota 8.4″ rear axle housings using 30-spline shafts—common in T100, first-gen Tacoma, early Tundra, etc.
- Always verify your rear axle dimensions, spline count, and housing style before ordering.
Advantages of This Assembly
- No User Setup Needed: Shimmed and adjusted at the factory for ease of install.
- Improved Rigidity: Nodular iron resists flex and maintains gear geometry under load.
- Full Locking Capability: Grizzly Locker provides torque to both wheels for traction in tough terrain.
Installation Notes & Cautions
- Follow proper break-in procedures for new gears and locker.
- Use the correct gear oil and fill amount per spec.
- Expect increased tire wear in tight, binded turns due to full locking during torque load.
- Verify bearing fits and housing tolerances prior to install to avoid damage.
Questions? We’re Here to Help.
Have questions about drivetrain upgrades or differential fitment for your truck? Our team at FASS Motorsports is here to assist:
- Phone: 636-429-7020
- Email: info@fassmotorsports.com
