Yukon Dana 60 Grizzly Locker - 40 Spline, 4.56 & Up
YGLD60-4-40
The Yukon Dana 60 40-Spline Grizzly Locker is a heavy-duty automatic locking differential built for Dana 60 axle assemblies upgraded to 40-spline axle shafts. When you're running oversized tires, serious horsepower, and aggressive terrain, the differential needs to be able to handle the same loads as the rest of the axle. The Grizzly mechanically locks both axle shafts together under power, helping keep rock crawlers, rock bouncers, mud trucks, and competition rigs moving when one tire loses traction.
Built with heat-treated 8620 steel internal components, large engagement teeth, and Yukon's patented mechanical locking design, this Grizzly Locker is engineered for demanding off-road drivetrain loads. Unlike a full spool that keeps both axle shafts permanently locked together, the Grizzly can allow differential action during turns when operating conditions permit. Designed for compatible Dana 60 differentials using 40-spline axle shafts and 4.56-and-up gear configurations, it provides automatic locking traction without air lines, wiring, or driver-operated switches.
Includes:
- (1) Yukon Dana 60 Grizzly Locker - 40-Spline
- Fully Assembled Internal Locking Mechanism
- Locking Differential Assembly
Important: Requires 40-spline axle shafts and a compatible Dana 60 differential with the 4.56-and-up carrier configuration. Not compatible with C-clip axle applications. Axle shafts, bearings, ring and pinion gears, and installation components are not listed as included.
Specifications
| Manufacturer | Yukon Gear & Axle |
|---|---|
| Product Type | Automatic Mechanical Locking Differential |
| Axle Platform | Dana Spicer 60 |
| Ring Gear Diameter | 9.75" |
| Axle Spline Count | 40-Spline |
| Carrier Break | 4.56 & Up |
| Gear Ratio Compatibility | 4.56 and Numerically Higher Ratios |
| Differential Type | Automatic Locker |
| Locking Style | Mechanical / Automatic Engagement |
| Internal Material | Heat-Treated 8620 Steel |
| Engagement Design | Patented Heavy-Duty Locking Teeth |
| Traction Type | Full Mechanical Lockup Under Load |
| Carrier Compatibility | Dana 60 4.56 & Up Configuration |
| C-Clip Compatibility | Not Compatible |
| Axle Position | Compatible Dana 60 Front / Rear Applications |
| Air Compressor Required | No |
| Electrical Controls Required | No |
| Assembly | Assembled in the USA |
| Installation Type | Differential Carrier Replacement & Gear Setup |
| Primary Application | 40-Spline Dana 60 Axle Builds, Rock Crawling & Competition Off-Road |
| Quantity | Sold Individually |
Fitment
Designed for compatible Dana 60 axle assemblies upgraded to 40-spline axle shafts and using the 4.56-and-up carrier configuration. The vehicle applications below are reference platforms only. Factory axle configurations vary, and this locker is not a direct replacement for different spline-count configurations.
| Make | Model | Year Range | Axle Application |
|---|---|---|---|
| Chevrolet | C10 Pickup | 1967–1972 | Dana 60, Verify Axle |
| Chevrolet | C10 Suburban | 1967–1972 | Dana 60, Verify Axle |
| Chevrolet | C20 Pickup | 1964–1972 | Dana 60, Verify Axle |
| Chevrolet | G10 Van | 1968–1972 | Dana 60, Verify Axle |
| Chevrolet | G30 | 1979–1987 | Dana 60, Verify Axle |
| Chevrolet | K10 Pickup | 1967–1972 | Dana 60, Verify Axle |
| Chevrolet | K10 Suburban | 1967–1972 | Dana 60, Verify Axle |
| Chevrolet | K20 Suburban | 1967–1972 | Dana 60, Verify Axle |
| Chevrolet | K30 Pickup | 1971–1974 | Dana 60, Verify Axle |
| Chevrolet | K30 | 1977–1986 | Dana 60, Verify Axle |
| Chevrolet | Suburban | 1964–1966 | Dana 60, Verify Axle |
| Chevrolet | V30 | 1987–1988 | Dana 60, Verify Axle |
| Dodge | B100 / B100 Van | 1971–1980 | Dana 60, Verify Axle |
| Dodge | B200 / B200 Van | 1971–1980 | Dana 60, Verify Axle |
| Dodge | B250 | 1981–1994 | Dana 60, Verify Axle |
| Dodge | B2500 | 1995–1998 | Dana 60, Verify Axle |
| Dodge | B300 / B300 Van | 1971–1980 | Dana 60, Verify Axle |
| Dodge | B350 | 1981–1994 | Dana 60, Verify Axle |
| Dodge | B3500 | 1995–1998 | Dana 60, Verify Axle |
| Dodge | Charger | 1969–1974 | Dana 60, Verify Axle |
| Dodge | D200 Pickup / Series | 1960–1980 | Dana 60, Verify Axle |
| Dodge | D250 | 1981–1993 | Dana 60, Verify Axle |
| Dodge | D300 Pickup / Series | 1960–1980 | Dana 60, Verify Axle |
| Dodge | D350 | 1981–1993 | Dana 60, Verify Axle |
| Dodge | Dart | 1969–1976 | Dana 60, Verify Axle |
| Dodge | Ram 1500 | 2004–2006 | Dana 60, Verify Axle |
| Dodge | Ram 2500 | 1994–2002 | Dana 60, Verify Axle |
| Dodge | Ram 2500 Van | 1999–2003 | Dana 60, Verify Axle |
| Dodge | Ram 3500 Van | 1999–2003 | Dana 60, Verify Axle |
| Dodge | W200 Pickup / Series | 1967–1980 | Dana 60, Verify Axle |
| Dodge | W250 | 1981–1993 | Dana 60, Verify Axle |
| Dodge | W300 Pickup / Series | 1960–1980 | Dana 60, Verify Axle |
| Dodge | W350 | 1981–1993 | Dana 60, Verify Axle |
| Ford | E-150 | 2008–2013 | Dana 60, Verify Axle |
| Ford | E-200 Econoline | 1969–1974 | Dana 60, Verify Axle |
| Ford | E-250 / E-250 Econoline | 1980–2014 | Dana 60, Verify Axle |
Fitment Notes:
- Fits compatible Dana Spicer 60 differential applications
- Requires 40-spline axle shafts
- Designed for the 4.56-and-up carrier configuration
- Not compatible with C-clip axle applications
- Not a direct replacement for factory 30-spline or 35-spline axle configurations
- Verify ring gear compatibility, axle identification, spline count, and carrier requirements before ordering
- Vehicle applications are reference fitments only; factory axle equipment may vary
- Professional differential installation and gear setup are recommended
Builder Note: This is a 40-spline differential upgrade for compatible Dana 60 axle builds. Confirm that the axle shafts, wheel ends, differential housing, and selected gear set are designed to work together before installation.
FAQ
What does the Yukon Dana 60 Grizzly Locker do?
The Grizzly Locker automatically locks both axle shafts together under power, helping maintain traction when one tire loses grip. Unlike an open differential, it provides mechanical lockup under load without requiring an air compressor, wiring, or driver-operated switch.
Will this locker fit a factory Dana 60 axle?
Only if the axle has been configured for the required 40-spline shafts and compatible differential components. Most factory Dana 60 axles use different spline configurations, so this locker is not a direct replacement for every Dana 60 differential. Verify the complete axle assembly before ordering.
What gear ratios does this Dana 60 Grizzly Locker fit?
This locker is designed for Dana 60 applications using the 4.56-and-up carrier configuration. Verify the selected ring and pinion gear set, carrier requirements, and axle configuration before ordering.
How is a Grizzly Locker different from a full spool?
A full spool permanently connects both axle shafts and forces both wheels to rotate at the same speed. The Grizzly Locker locks under power but can allow differential action during turns when operating conditions permit. This gives the vehicle improved maneuverability compared with a permanently locked spool.
Does this Grizzly Locker require an air compressor or wiring?
No. The Yukon Grizzly is a fully mechanical automatic locker. It engages under drivetrain load without compressed air, electrical wiring, switches, or driver-operated controls.
Can this locker be used with C-clip axle shafts?
No. This 40-spline Dana 60 Grizzly Locker is not compatible with C-clip axle applications. Verify the axle shaft retention system before ordering.
Is this locker a good choice for rock bouncers and high-horsepower builds?
Yes. The Grizzly uses large internal engagement teeth and heat-treated 8620 steel components designed for demanding drivetrain loads. It's a strong traction option for rock crawlers, rock bouncers, mud trucks, and competition vehicles running oversized tires and high-torque engines. Overall drivetrain reliability still depends on the axle shafts, housing, gearing, and complete wheel-end configuration.
Does installing this locker require differential setup?
Yes. Replacing the differential carrier requires proper carrier bearing preload, ring gear backlash, and gear contact pattern verification. Incorrect setup can cause noise, premature wear, or gear failure. We recommend professional installation and inspection of the existing ring and pinion, bearings, and axle