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Heavy Duty Locking Hub Set for GM 8.5in Front and Dana 44 Differentials, 19 Spline, Part YHC70007
The Yukon Gear YHC70007 Hardcore Locking Hub set provides the ultimate in manual front hub engagement for 1971-1977 Ford Bronco and 1979-1991 GM trucks and SUVs equipped with GM 8.5 inch front or Dana 44 front differentials with 19 spline axle shafts. Built entirely from all-steel construction with Chrome-Moly internal components, the YHC70007 will not disengage under high torque loads and defaults to the locked position during use. A proprietary low-friction coating on the locking gears combined with a low-profile bezel design rounds out this purpose-built hub for serious off-road and towing use.
Features and Benefits
- Fits 1979-1991 GM trucks and SUVs with GM 8.5in front differential and 1971-1977 Ford Bronco Dana 44 front, 19 spline
- All-steel construction with Chrome-Moly internal gears for maximum strength
- Defaults to locked position during use to prevent inadvertent disengagement
- Engagement in just 1/3 turn of the all-steel low-profile bezel
- Low-profile bezel design minimizes impact exposure on the trail
- Proprietary coating on locking gears reduces friction and extends service life
- Limited Lifetime warranty against manufacturer defects
- Sold as a complete set (2 hubs)
Vehicle Fitment
| Year | Make | Model | Trim |
|---|---|---|---|
| 1971 | Ford | Bronco | Sport |
| 1972 | Ford | Bronco | Sport |
| 1973 | Ford | Bronco | Sport |
| 1974 | Ford | Bronco | Sport |
| 1975 | Ford | Bronco | Sport |
| 1976 | Ford | Bronco | Sport |
| 1977 | Ford | Bronco | Sport |
| 1979 | Chevrolet | K5 Blazer | Silverado |
| 1980 | Chevrolet | K5 Blazer | Silverado |
| 1981 | Chevrolet | K5 Blazer | Silverado |
| 1982 | Chevrolet | K5 Blazer | Silverado |
| 1983 | Chevrolet | K5 Blazer | Silverado |
| 1984 | Chevrolet | K5 Blazer | Scottsdale |
| 1985 | Chevrolet | K5 Blazer | Silverado |
| 1986 | Chevrolet | K5 Blazer | Silverado |
| 1987 | Chevrolet | Blazer | Silverado |
| 1988 | Chevrolet | Blazer | Silverado |
| 1989 | Chevrolet | Blazer | Silverado |
| 1990 | Chevrolet | Blazer | Silverado |
| 1991 | Chevrolet | Blazer | Silverado |
| 1979 | Chevrolet | K10 | Silverado |
| 1980 | Chevrolet | K10 | Silverado |
| 1981 | Chevrolet | K10 | Silverado |
| 1982 | Chevrolet | K10 | Silverado |
| 1983 | Chevrolet | K10 | Silverado |
| 1984 | Chevrolet | K10 | Scottsdale |
| 1985 | Chevrolet | K10 | Scottsdale |
| 1986 | Chevrolet | K10 | Silverado |
| 1979 | Chevrolet | K20 | Scottsdale |
| 1980 | Chevrolet | K20 | Scottsdale |
| 1981 | Chevrolet | K20 | Scottsdale |
| 1982 | Chevrolet | K20 | Scottsdale |
| 1983 | Chevrolet | K20 | Scottsdale |
| 1984 | Chevrolet | K20 | Scottsdale |
| 1985 | Chevrolet | K20 | Silverado |
| 1986 | Chevrolet | K20 | Silverado |
| 1979 | GMC | K1500 | High Sierra |
| 1980 | GMC | K1500 | High Sierra |
| 1981 | GMC | K1500 | High Sierra |
| 1982 | GMC | K1500 | Sierra Classic |
| 1983 | GMC | K1500 | Sierra Classic |
| 1984 | GMC | K1500 | Sierra Classic |
| 1985 | GMC | K1500 | Sierra Classic |
| 1986 | GMC | K1500 | Sierra Classic |
| 1979 | GMC | K2500 | High Sierra |
| 1980 | GMC | K2500 | High Sierra |
| 1981 | GMC | K2500 | High Sierra |
| 1982 | GMC | K2500 | Sierra Classic |
| 1983 | GMC | K2500 | Sierra Classic |
| 1984 | GMC | K2500 | Sierra Classic |
| 1985 | GMC | K2500 | Sierra Classic |
| 1986 | GMC | K2500 | Sierra Classic |
Specifications
| Specification | Detail |
|---|---|
| Part Number | YHC70007 |
| UPC | 883584290964 |
| Differential | GM 8.5 in. Front / Dana 44 Front |
| Spline Count | 19 spline |
| Material | All Steel / Chrome-Moly Internals |
| Quantity | Set of 2 |
| Country of Origin | USA |
| Warranty | Limited Lifetime |
What's Included
- Two Yukon Hardcore Locking Hubs (driver and passenger side)
- All installation hardware
Frequently Asked Questions
What vehicles does the YHC70007 fit?
The YHC70007 fits 1971-1977 Ford Bronco with Dana 44 front and 1979-1991 GM K10, K20, K5 Blazer, and Suburban models equipped with the GM 8.5 inch front or Dana 44 front differential with 19 spline axle shafts.
What is the spline count required for YHC70007?
The YHC70007 requires a 19 spline front axle shaft. Verify your spline count before ordering.
How does the YHC70007 engage?
Engagement requires only a 1/3 turn of the all-steel low-profile bezel. The hub defaults to locked under use, preventing accidental disengagement during off-road driving.
Will aftermarket locking hubs affect my warranty under the Magnuson-Moss Warranty Act?
The Magnuson-Moss Warranty Act protects consumers from having their warranty voided solely due to use of aftermarket parts. The dealer must prove the YHC70007 caused any related failure before denying a warranty claim.
What warranty does Yukon provide on the YHC70007?
The YHC70007 is covered by a Limited Lifetime warranty against manufacturer defects.
Does the YHC70007 work with the Stage-8 locking nut system?
No. The YHC70007 is not compatible with Stage-8 lock nuts. Verify your spindle nut configuration before ordering.
Are Chrome-Moly internals necessary in a locking hub?
Chrome-Moly alloy provides superior tensile strength and fatigue resistance compared to standard steel. In high torque and off-road applications, Chrome-Moly internals significantly reduce the risk of hub failure.
Can the YHC70007 be installed by a home mechanic?
Yes. Installation requires standard hand tools and basic mechanical knowledge of front axle disassembly. No special press equipment is required.
Installation Instructions
- Raise and support the front of the vehicle on jack stands.
- Remove the front wheels.
- Remove the existing factory or worn locking hubs by removing the retaining screws from the hub face.
- Clean the spindle and axle shaft end thoroughly.
- Verify the axle shaft spline count is 19 splines before proceeding.
- Slide the inner hub body of the YHC70007 onto the axle shaft splines.
- Install the inner snap ring or retaining clip per the included instructions.
- Thread and torque the spindle nut per your vehicle service manual specification.
- Install the outer hub cap assembly and fasten the retaining screws.
- Repeat on the opposite side.
- Reinstall wheels and road-test by engaging and disengaging 4WD.
Prop 65 Warning: This product can expose you to chemicals including arsenic, 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.
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