Click to zoom in
Yukon Gear Grizzly Locker, Ford 9in, 31 Spline Axles
Yukon Gear part YGLF9-31 is a Grizzly Locker engineered for the Ford 9in differential with 31-spline axles. The Yukon Grizzly Locker is a mechanical positive-locking differential built for rock crawling, serious trail running, off-road racing, and drag racing, providing 100% power to both tires while still allowing disengagement in turns.
Key Features
- Mechanical positive-locking differential
- Provides 100% power to both tires when locked
- Patented inner clutch teeth design with larger base radius for up to 350% greater strength versus back-cut designs
- Resists breakage from shock-loading or catastrophic axle failure
- Fits the Ford 9in differential with 31-spline axles
Fitment
Fits vehicles equipped with the Ford 9in differential and 31-spline axles. Confirm your exact differential and spline count before ordering.
Specifications
| Detail | Value |
|---|---|
| Manufacturer part number | YGLF9-31 |
| Application | Ford 9in differential |
| Spline count | 31 |
| Type | Locking differential (Grizzly Locker) |
What's Included
- 1 Grizzly Locker unit
About Yukon Gear
Yukon Gear & Axle manufactures differential, axle, and drivetrain components engineered for durable, precise-fit replacement and upgrade applications.
FAQ
What does the Grizzly Locker do?The Grizzly Locker is a mechanical locking differential that delivers 100% power to both wheels for maximum traction, while still allowing disengagement for turning.
What differential does this locker fit?This locker fits the Ford 9in differential with 31-spline axles.
Is the Grizzly Locker good for daily driving?Lockers change on-road driving characteristics; many owners use them primarily for off-road and racing use rather than daily street driving.
What makes the Grizzly Locker stronger than competitors?Its patented inner clutch teeth have a larger base radius, offering up to 350% greater strength than back-cut designs, resisting breakage under shock loads.
Is professional installation recommended?Yes. Installing a locker requires differential disassembly and precise setup, and should be performed by a qualified technician.
Can this locker be used for drag racing?Yes, the Grizzly Locker is engineered for rock crawling, trail running, off-road racing, and drag racing applications.
Does this include a ring and pinion gear set?No, this listing is for the locker only; gears should be ordered separately if needed.
Do I need to confirm fitment before ordering?Yes. Confirm your exact differential and spline count before ordering.
Installation Instructions
- Remove the differential cover and carrier assembly.
- Remove the factory open differential or locker.
- Install the Grizzly Locker into the carrier housing.
- Reassemble the carrier and torque all fasteners to specification.
WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
Differentials
Performance differentials, limited-slip differentials, locking differentials, and traction upgrades are stocked at Black Ops Auto Works. Shop clutch-type LSDs, helical gear LSDs, automatic lockers, selectable air lockers, electronic lockers, spool-style race components, differential carriers, truck and Jeep lockers, import performance LSDs, and axle-specific units for Subaru WRX and STI, Nissan Z and Skyline, BMW M, Mazda Miata, Porsche, Ford 8.8, Dana axles, GM trucks, Ram trucks, and off-road builds. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 235 differential SKUs across limited-slip designs, locking systems, axle spline counts, carrier cases, street and track traction upgrades, off-road configurations, and drivetrain-specific fitment. What This Differential Collection Covers A differential splits torque between driven wheels while allowing different wheel speeds through ...
View Differentials Products
Differentials & Components
Differentials and components at Black Ops Auto Works include diff braces, diff covers, rebuild and overhaul kits, differential bushings and mounts, limited-slip differentials, yokes, and final drive gears built for street, towing, off-road, and racing applications. Black Ops Auto Works carries 1,332 drivetrain SKUs from Yukon Gear and Axle, ARB, OS Giken, SuperPro, and Per4mance Development, spanning Hellcat and Trackhawk platforms, trucks, Jeep Wrangler, and sport compacts. What This Collection Covers This collection combines fifteen related differential and drivetrain categories, including diff braces, diff covers and gaskets, rebuild and overhaul kits, install kits, seal kits, bushings, mounts, housings, dropouts, spider gears, yokes, complete differentials, and final drive gears. Product Types in This Collection Shoppers will find billet differential braces for high-horsepower RWD platforms, nodular iron and aluminum diff covers, master overhaul kits, differential-to-cradle ...
View Differentials & Components Products
Drivetrain
Drivetrain parts for high-horsepower Mopar, truck, Jeep, and import platforms are stocked at Black Ops Auto Works. Shop differentials, axles, driveshafts, clutch kits, flywheels, flexplates, shifters, transmission components, ring and pinion gears, differential braces, and driveline hardware for Hellcat, Trackhawk, TRX, HEMI, LS, LT, Coyote, and turbocharged import platforms. Every drivetrain part is filterable by vehicle platform, drivetrain layout, transmission type, and power level so the correct part ships the first time. Black Ops Auto Works carries 4,765 drivetrain SKUs across differentials, axles, clutches, and transmission hardware. What This Category Covers The drivetrain transfers power from the engine to the wheels and includes the transmission, clutch, driveshafts, axles, differentials, ring and pinion gears, wheel hubs, wheel bearings, U-joints, shifters, mounts, and bushings. Upgrading these components improves power delivery, durability, and reliability under incr...
View Drivetrain Products
Yukon Gear & Axle
Yukon Gear and Axle drivetrain parts are stocked at Black Ops Auto Works for GM, Ford, Chrysler, Ram, and Jeep platforms. Shop ring and pinion sets, positraction and locker units, axle overhaul kits, differential covers, driveshafts, and manual transmission rebuild components for Dana 60/61, GM 8.2/8.5/8.6/9.5, Ford 8.8/9/10.25/10.5, and Chrysler 8.25/9.25 inch axles. Yukon parts are proven in extreme-duty use, including King of the Hammers and Moab rock crawling events, and every part here is filterable by axle size, gear ratio, and spline count. Black Ops Auto Works carries 1122 Yukon Gear and Axle SKUs across ring and pinion, differential, and axle rebuild categories. What This Brand Covers Yukon Gear and Axle builds ring and pinion sets, differential carriers, positraction and locking differentials, axle shafts, bearing and seal kits, driveshafts, and manual transmission rebuild components for domestic trucks, SUVs, and Jeeps. The brand is best known for supporting extreme-d...
View Yukon Gear & Axle Products