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
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