SKU: YDGF9-31-AG | UPC: 883584260097
Yukon Gear Dura Grip Positraction Limited Slip Differential for Ford 9" 31 Spline Axles Aggressive Design Fits 1957-1988 Ford Models
The Yukon Dura Grip YDGF9-31-AG is a positraction limited slip differential designed for Ford 9-inch differentials with 31 spline axles. It fits a wide range of Ford vehicles from 1957 to 1988 including Mustangs Broncos F-Series trucks Fairlanes Rancheros and Econolines. This aggressive design provides smooth operation with strong traction for off-road street and track use delivering reliable power to both wheels.
Key Features
- Aggressive Clutch Pack: Composite clutches engage quickly for maximum grip in low traction conditions across dirt mud snow or pavement
- High Strength Nodular Case: Cast from durable nodular iron to withstand high torque and heavy abuse
- Forged 4320 Chromoly Spider Gears: Heat treated for exceptional strength and longevity under extreme loads
- Rebuildable Design: Serviceable clutches and components allow multiple rebuilds for extended service life
- Smooth Positraction Operation: Transfers power evenly without chatter for confident handling in varied terrains
Product Notes
- Direct replacement for open differentials or factory lockers in Ford 9-inch housings
- Requires proper break-in procedure with specific gear oil additive for optimal clutch performance
- Packaged in sturdy box dimensions 11.8 x 11.8 x 11.8 inches product weight 27.85 lbs shipping weight 30 lbs
Installation Notes
- Professional installation recommended.
- Confirm 31 spline axles and Ford 9-inch ring gear 9.0 to 9.75-inch diameter
- Uses factory hardware torque specs per Ford service manual includes clutch preload shims
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 1957-1970 | Ford | Fairlane | 500 |
| 1966-1967 | Ford | Fairlane | 500XL |
| 1957-1969 | Ford | Fairlane | Base |
| 1960-1970 | Ford | Falcon | Base |
| 1962 | Ford | Falcon | Deluxe |
| 1963-1970 | Ford | Falcon | Futura |
| 1963-1965 | Ford | Falcon | Futura Sprint |
| 1959-1967 | Ford | Galaxie | Base |
| 1957-1974 | Ford | F-100 | Base |
| 1976-1978 | Ford | F-100 | Base |
| 1983 | Ford | F-100 | Base |
| 1975-1982 | Ford | F-100 | Custom |
| 1975-1978 | Ford | F-100 | Northland |
| 1975-1981 | Ford | F-100 | Ranger |
| 1978-1981 | Ford | F-100 | Ranger Lariat |
| 1975-1981 | Ford | F-100 | Ranger XLT |
| 1961 | Ford | Galaxie | Club Victoria |
| 1960 | Ford | Galaxie | Special |
| 1961 | Ford | Galaxie | Starliner |
| 1961 | Ford | Galaxie | Sunliner |
| 1961 | Ford | Galaxie | Town Victoria |
| 1968-1974 | Ford | Galaxie 500 | Base |
| 1968-1970 | Ford | Galaxie 500 | XL |
| 1972-1976 | Ford | Gran Torino | Base |
| 1964-1969 | Mercury | Comet | Base |
| 1971-1977 | Mercury | Comet | Base |
| 1967-1973 | Mercury | Cougar | Base |
| 1977-1979 | Mercury | Cougar | Base |
| 1969-1970 | Mercury | Cougar | Boss 302 |
| 1969-1970 | Mercury | Cougar | Boss 429 |
| 1977 | Mercury | Cougar | Brougham |
| 1966-1974 | Ford | Bronco | Base |
| 1975-1986 | Ford | Bronco | Custom |
| 1985-1986 | Ford | Bronco | Eddie Bauer |
| 1975 | Ford | Bronco | Northland |
| 1978 | Ford | Bronco | Northland |
| 1975 | Ford | Bronco | Ranger |
| 1978-1981 | Ford | Bronco | Ranger XLT |
| 1968-1969 | Ford | Bronco | Roadster |
| 1967-1979 | Ford | Ranchero | 500 |
| 1967 | Ford | Ranchero | 500 XL |
| 1957-1971 | Ford | Ranchero | Base |
| 1957-1958 | Ford | Ranchero | Custom |
| 1966 | Ford | Ranchero | Custom |
| 1968-1979 | Ford | Ranchero | GT |
| 1970-1979 | Ford | Ranchero | Squire |
| 1955-1979 | Ford | Thunderbird | Base |
| 1969-1970 | Ford | Mustang | Boss 429 |
| 1970-1973 | Ford | Mustang | Grande |
| 1970-1973 | Ford | Mustang | Mach 1 |
| 1965-1970 | Ford | Mustang | Shelby GT-350 |
| 1966 | Ford | Mustang | Shelby GT-350H |
| 1967-1970 | Ford | Mustang | Shelby GT-500 |
| 1968 | Ford | Mustang | Shelby GT-500KR |
| 1969-1970 | Mercury | Cougar | Cobra Jet |
| 1977 | Mercury | Cougar | Villager |
| 1967-1979 | Mercury | Cougar | XR-7 |
| 1975-1980 | Mercury | Grand Marquis | Base |
| 1979-1980 | Mercury | Grand Marquis | Colony Park |
| 1969-1974 | Ford | E-100 Econoline | Club Wagon |
| 1975-1983 | Ford | E-100 Econoline | Custom |
| 1975-1978 | Ford | E-100 Econoline | Northland |
| 1983 | Ford | E-100 Econoline | XL |
| 1979-1982 | Ford | E-150 Econoline | Base |
| 1984-1986 | Ford | E-150 Econoline | Base |
| 1969-1974 | Ford | E-200 Econoline | Club Wagon |
| 1970-1974 | Ford | E-200 Econoline | Custom Wagon |
| 1975-1980 | Ford | E-250 Econoline | Base |
| 1975-1980 | Ford | E-250 Econoline | Chateau |
| 1975-1980 | Ford | E-250 Econoline | Custom |
| 1975-1978 | Ford | E-250 Econoline | Northland |
| 1970-1976 | Ford | LTD | Brougham |
| 1975-1979 | Ford | LTD | Country Squire |
| 1975-1979 | Ford | LTD | Landau |
| 1970-1977 | Ford | Maverick | Base |
| 1975-1977 | Ford | Maverick | Grabber |
| 1965-1973 | Ford | Mustang | Base |
| 1969-1971 | Ford | Mustang | Boss 302 |
| 1971-1972 | Ford | Mustang | Boss 351 |
| 1973-1976 | Ford | Gran Torino | Brougham |
| 1974-1975 | Ford | Gran Torino | Elite |
| 1972-1975 | Ford | Gran Torino | Sport |
| 1972-1976 | Ford | Gran Torino | Squire |
| 1975-1979 | Ford | Granada | Base |
| 1978-1979 | Ford | Granada | ESS |
| 1975-1979 | Ford | Granada | Ghia |
| 1965-1979 | Ford | LTD | Base |
| 1975-1977 | Ford | Bronco | Sport |
| 1968-1973 | Ford | Bronco | Wagon |
| 1982-1983 | Ford | Bronco | XLS |
| 1984-1986 | Ford | Bronco | XLT |
| 1982-1983 | Ford | Bronco | XLT Lariat |
| 1969-1982 | Ford | E-100 Econoline | Base |
| 1975-1982 | Ford | E-100 Econoline | Chateau |
| 1975-1981 | Ford | F-150 | Ranger |
| 1978-1981 | Ford | F-150 | Ranger Lariat |
| 1975-1981 | Ford | F-150 | Ranger XLT |
| 1982-1987 | Ford | F-150 | XL |
| 1982-1983 | Ford | F-150 | XLS |
| 1977 | Ford | F-150 | XLT |
| 1983-1984 | Ford | F-150 | XLT |
| 1982 | Ford | F-150 | XLT Lariat |
| 1985-1987 | Ford | F-150 | XLT Lariat |
| 1978 | Ford | Thunderbird | Diamond Jubilee |
| 1979 | Ford | Thunderbird | Heritage |
| 1978-1979 | Ford | Thunderbird | Town Landau |
| 1958-1979 | Lincoln | Continental | Base |
| 1968-1971 | Lincoln | Mark III | Base |
| 1964-1965 | Mercury | Comet | 202 |
| 1964-1965 | Mercury | Comet | 404 |
| 1979-1982 | Ford | E-150 Econoline | Chateau |
| 1979-1983 | Ford | E-150 Econoline | Custom |
| 1987-1988 | Ford | E-150 Econoline | Custom |
| 1983-1988 | Ford | E-150 Econoline | XL |
| 1971-1972 | Ford | E-200 Econoline | Chateau Wagon |
| 1982-1983 | Ford | F-100 | XL |
| 1982-1983 | Ford | F-100 | XLS |
| 1977 | Ford | F-100 | XLT |
| 1982-1983 | Ford | F-100 | XLT Lariat |
| 1976-1978 | Ford | F-150 | Base |
| 1983-1986 | Ford | F-150 | Base |
| 1975-1982 | Ford | F-150 | Custom |
| 1987 | Ford | F-150 | Custom |
| 1975-1978 | Ford | F-150 | Northland |
Why Choose Yukon Gear?
- Over 40 years engineering driveline components for trucks SUVs and off-road vehicles
- Uses premium materials like chromoly steel and nodular iron for daily driver and race durability
- Precise tolerances ensure quiet operation and direct fit in OEM housings
Frequently Asked Questions
-
Q: Will this fit my 1969 Ford Mustang with Ford 9-inch rear?
A: Yes it fits 1965-1973 Mustang Base Boss 302 Boss 351 Boss 429 Mach 1 Shelby models with 31 spline axles confirm your axle spline count -
Q: What materials are used in the spider gears and case?
A: Forged 4320 chromoly spider gears and high strength nodular iron case built for high horsepower and torque applications -
Q: What warranty covers this Dura Grip?
A: Backed by Yukon Gear limited warranty rebuildable design extends usability contact manufacturer for details
Shipping & Handling
- Method: UPS Ground or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Secure foam protected box 11.8 x 11.8 x 11.8 inches
- Weight: 27.85 lbs product 30 lbs shipping
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


