Yukon Gear Grizzly Locker For Dana 60 / 4.10 & Down / 35 Spline

Yukon Gear Grizzly Locker for Dana 60 with 35 Spline Axles and 4.10 Down Gear Ratio

Part number YGLD60-3-35, the Yukon Gear Grizzly Locker is a mechanical positive-locking differential engineered for rock crawling, serious trail running, off-road racing, and drag racing. Designed to fit Dana Spicer 60 housings with 35 spline axles and gear ratios of 4.10 and numerically lower, YGLD60-3-35 replaces the factory carrier and delivers 100% locking power to both tires under load, then disengages automatically during turns. This is a true selectable automatic locker that locks under power and unlocks on deceleration, making it suitable for both on-road and serious off-road use. The Grizzly Locker is assembled in the USA and backed by Yukon's industry-leading warranty.

Features and Benefits

• Fits Dana Spicer 60 rear or front differentials with 35 spline axles and 4.10 and down gear ratios
• Patented internal design reduces the most common locker failure modes
• Inner clutch teeth have a larger radius at the base, delivering up to 350% greater strength versus back-cut designs
• Larger teeth resist breakage from shock-loading and catastrophic axle failure events
• 8620 chromoly alloy steel internals for maximum impact and wear resistance
• Forged case construction for long-term durability under heavy loads
• 100% power delivered to both tires under load with automatic disengagement in turns
• Compatible with straight-axle Dana 60 applications found in heavy-duty trucks and SUVs
• Not compatible with c-clip axle designs
• Assembled in the USA
• 1-year limited manufacturer warranty with up to $2,000 in collateral damage coverage

Vehicle Fitment

Specifications

What's Included

• One (1) Yukon Grizzly Locker complete carrier assembly (YGLD60-3-35)
• All internal components pre-assembled

Frequently Asked Questions

What vehicles does the YGLD60-3-35 fit?
This locker fits any vehicle equipped with a Dana Spicer 60 differential using 35 spline axles and a gear ratio of 4.10 or numerically lower (such as 4.10, 3.73, 3.55, etc.). Common applications include Ford F-250 Super Duty, Ford F-350 Super Duty, Dodge Ram 2500, Dodge Ram 3500, and various heavy-duty GM trucks and vans from the 1960s through the early 2000s.

What is a Grizzly Locker and how does it differ from an LSD?
The Grizzly Locker is an automatic mechanical locker that locks both axle shafts together under power, delivering 100% torque to both wheels. A limited-slip differential (LSD), such as the Yukon Dura Grip, allows some slip between the two axles and uses clutch packs or friction cones to bias torque. The locker is more aggressive in traction delivery while the LSD is smoother for everyday driving.

Can I run this locker on the street?
Yes. The Grizzly Locker automatically disengages during cornering, which makes it more street-friendly than a spool or welded differential. However, some tire scrub and slight steering pull on dry pavement is normal, especially in 4WD. Most owners use this in rear differentials of trucks driven on and off road.

Do I need to replace my ring and pinion when installing YGLD60-3-35?
No, the YGLD60-3-35 is a carrier replacement only. You keep your existing ring gear and pinion unless they are worn or you are also changing gear ratios.

Is this compatible with my Ford F-250 Super Duty Dana 60?
Yes, the YGLD60-3-35 fits 1999 through 2015 Ford F-250 Super Duty and F-350 Super Duty models equipped with the Dana 60 rear axle, 35 spline shafts, and gear ratios of 4.10 and down.

Does this locker void my vehicle warranty under the Magnuson-Moss Warranty Act?
Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your vehicle warranty simply because you installed an aftermarket part unless they can prove that specific part caused the failure. Replacing the differential carrier does not automatically void the entire vehicle warranty. Consult your dealer or legal advisor for your specific situation.

Will YGLD60-3-35 work with c-clip axles?
No. This locker is not compatible with c-clip axle retention designs. Verify your Dana 60 uses a bolt-in or press-in axle design before ordering.

What gear oil does Yukon recommend for this locker?
For best longevity and quiet operation with the Grizzly Locker, use standard GL-5 gear oil. No friction modifier or positraction additive is required since this is a mechanical locker, not a clutch-pack LSD.

Installation Instructions

1. Raise and safely support the vehicle on jack stands. Drain the differential gear oil.
2. Remove the differential cover and gasket. Clean the mating surfaces thoroughly.
3. Mark the bearing caps for reinstallation in the same position and orientation.
4. Remove the bearing cap bolts and carefully slide out the factory carrier assembly with bearings and shims. Keep shims organized for each side.
5. Remove the ring gear from the factory carrier and inspect ring gear teeth and bolts for wear. Clean the ring gear bolt holes.
6. Install the ring gear onto the Grizzly Locker carrier (YGLD60-3-35) using new ring gear bolts. Torque to specification for Dana 60 (typically 70 to 90 ft-lb).
7. Press the original carrier bearings onto the Grizzly Locker carrier hubs, or install new carrier bearings if replacing.
8. Set the Grizzly Locker carrier assembly into the differential housing with the original shim stacks. Reinstall bearing caps in their original positions and hand-tighten.
9. Check and adjust ring gear backlash (typically 0.005 to 0.009 in for Dana 60) and carrier bearing preload using the original shim setup as a starting point. Adjust shims as needed.
10. Perform a gear pattern check using marking compound to verify proper tooth contact.
11. Torque bearing cap bolts to Dana 60 specification (typically 80 to 100 ft-lb).
12. Install a new differential cover gasket and cover. Refill with the manufacturer-recommended GL-5 gear oil to the proper level.
13. Road test the vehicle and listen for any abnormal noise during the break-in period.

Proposition 65 Warning: This product can expose you to chemicals including lead, which is 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.