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Yukon Gear & Axle YP FSF9-40 Full Spool
If you're looking to maximize traction and performance on your dedicated off-road or drag racing vehicle, the Yukon Gear & Axle YP FSF9-40 Full Spool is the perfect upgrade. Designed specifically for Ford 9" differentials with 40 spline axles, this spool replaces your differential carrier assembly, providing a straightforward installation process that even DIY enthusiasts will appreciate.
Key Features
- Compatible with Ford 9" differentials featuring 40 spline axles.
- Delivers 100% lockup, ensuring both wheels receive equal power for maximum traction.
- Not suitable for street-driven vehicles; ideal for serious off-road and drag racing applications.
Technical Specifications
- Material: High-quality 8620 steel, heat-treated for enhanced strength.
- Color: Bare finish.
- Grade Type: Performance grade.
- Mounting Hole Quantity: 10.
- Spline Quantity: 40.
Fitment
The YP FSF9-40 Full Spool fits a variety of Ford models, making it a versatile choice for many classic and modern builds. Here’s a list of compatible vehicles:
- Ford Bronco (1966-1986)
- Ford E-100 (1975-1978)
- Ford F-100 (1957-1983)
- Ford F-150 (1975-1987)
- Ford Fairlane (1957-1970)
- Ford Falcon (1960-1970)
- Ford Galaxie (1959-1967)
- Ford Galaxie 500 (1968-1974)
- Ford Gran Torino (1972-1976)
- Ford Granada (1975-1979)
- Ford LTD (1967-1979)
- Ford Maverick (1970-1977)
- Ford Mustang (1965-1973)
- Ford Ranchero (1957-1979)
- Ford Thunderbird (1955-1979)
- Lincoln Continental (1961-1979)
- Lincoln Mark III (1969-1971)
- Mercury Comet (1964-1969 & 1971-1977)
- Mercury Cougar (1967-1979)
- Mercury Grand Marquis (1975-1978 & 1980)
Customer Insights
Many F-150 owners have shared their experiences after installing the YP FSF9-40. One enthusiast noted, "I installed this spool in my 1985 F-150 for drag racing, and the difference was night and day. It locked up perfectly, allowing me to launch without any wheel spin!" Another user with a 1970 Mustang mentioned, "This spool transformed my car's performance on the track—100% traction and no worries about losing power on launches."
Upgrade your ride with the Yukon YP FSF9-40 Full Spool and experience the enhanced traction and performance that comes with a 100% lockup differential. It’s a must-have for anyone serious about off-road adventures or drag racing!
Proposition 65
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
| Vehicle Make/Model | Year | Trims |
|---|---|---|
| Ford Bronco | 1966-1974 | Base |
| Ford Bronco | 1968-1973 | Wagon |
| Ford Bronco | 1968-1969 | Roadster |
| Ford Bronco | 1975-1986 | Custom |
| Ford Bronco | 1975 | Ranger |
| Ford Bronco | 1975, 1978 | Northland |
| Ford Bronco | 1975-1977 | Sport |
| Ford Bronco | 1978-1981 | Ranger XLT |
| Ford Bronco | 1982-1983 | XLT Lariat |
| Ford Bronco | 1982-1983 | XLS |
| Ford Bronco | 1984-1986 | XLT |
| Ford Bronco | 1985-1986 | Eddie Bauer |
| Ford Bronco II | 1984-1986 | Eddie Bauer |
| Ford Bronco II | 1984-1985 | XLS |
| Ford Bronco II | 1984-1986 | Base |
| Ford Bronco II | 1984-1986 | XLT |
| Ford E-100 Econoline | 1975-1978 | Base |
| Ford E-100 Econoline | 1975-1978 | Custom |
| Ford E-100 Econoline | 1975-1978 | Chateau |
| Ford E-100 Econoline | 1975-1978 | Northland |
| Ford E-100 Econoline Club Wagon | 1975-1978 | Chateau |
| Ford E-100 Econoline Club Wagon | 1975-1978 | Custom |
| Ford E-100 Econoline Club Wagon | 1975-1978 | Northland |
| Ford E-100 Econoline Club Wagon | 1975-1978 | Base |
| Ford F-100 | 1957-1979, 1983 | Base |
| Ford F-100 | 1975-1981 | Ranger |
| Ford F-100 | 1975-1982 | Custom |
| Ford F-100 | 1975-1981 | Ranger XLT |
| Ford F-100 | 1975-1978 | Northland |
| Ford F-100 | 1977 | XLT |
| Ford F-100 | 1978-1981 | Ranger Lariat |
| Ford F-100 | 1982-1983 | XL |
| Ford F-100 | 1982-1983 | XLS |
| Ford F-100 | 1982-1983 | XLT Lariat |
| Ford F-150 | 1975-1981, 1984-1987 | Ranger |
| Ford F-150 | 1975-1978 | Northland |
| Ford F-150 | 1975-1981 | Ranger XLT |
| Ford F-150 | 1975-1987 | Custom |
| Ford F-150 | 1976-1978, 1983-1986 | Base |
| Ford F-150 | 1977, 1983-1984 | XLT |
| Ford F-150 | 1978-1981 | Ranger Lariat |
| Ford F-150 | 1982-1983 | XLS |
| Ford F-150 | 1982-1987 | XL |
| Ford F-150 | 1982, 1985-1987 | XLT Lariat |
| Ford Fairlane | 1957-1969 | Base |
| Ford Fairlane | 1957-1970 | 500 |
| Ford Fairlane | 1966-1967 | 500XL |
| Ford Falcon | 1960-1970 | Base |
| Ford Falcon | 1962 | Deluxe |
| Ford Falcon | 1963-1970 | Futura |
| Ford Falcon | 1963-1965 | Futura Sprint |
| Ford Falcon Sedan Delivery | 1961-1965 | Base |
| Ford Galaxie | 1959-1967 | Base |
| Ford Galaxie | 1960 | Special |
| Ford Galaxie | 1961 | Town Victoria |
| Ford Galaxie | 1961 | Starliner |
| Ford Galaxie | 1961 | Sunliner |
| Ford Galaxie | 1961 | Club Victoria |
| Ford Galaxie 500 | 1962-1974 | Base |
| Ford Galaxie 500 | 1962-1964 | Sunliner |
| Ford Galaxie 500 | 1962-1964 | Victoria |
| Ford Galaxie 500 | 1962-1970 | XL |
| Ford Gran Torino | 1972-1976 | Squire |
| Ford Gran Torino | 1972-1975 | Sport |
| Ford Gran Torino | 1972-1976 | Base |
| Ford Gran Torino | 1973-1976 | Brougham |
| Ford Gran Torino | 1974-1975 | Elite |
| Ford Granada | 1975-1979 | Ghia |
| Ford Granada | 1975-1979 | Base |
| Ford Granada | 1978-1979 | ESS |
| Ford LTD | 1967-1979 | Base |
| Ford LTD | 1970-1976 | Brougham |
| Ford LTD | 1975-1979 | Country Squire |
| Ford LTD | 1975-1979 | Landau |
| Ford LTD II | 1977 | Squire |
| Ford LTD II | 1977-1979 | Base |
| Ford LTD II | 1977-1978 | Brougham |
| Ford LTD II | 1977-1979 | S |
| Ford LTD II | 1979 | Landau |
| Ford Maverick | 1970-1977 | Base |
| Ford Maverick | 1975-1977 | Grabber |
| Ford Mustang | 1965-1973 | Base |
| Ford Mustang | 1966 | Shelby GT-350H |
| Ford Mustang | 1967-1970 | Shelby GT-500 |
| Ford Mustang | 1968 | Shelby GT-500KR |
| Ford Mustang | 1968-1970 | Shelby GT-350 |
| Ford Mustang | 1969-1970 | Boss 429 |
| Ford Mustang | 1970-1973 | Mach 1 |
| Ford Mustang | 1970-1973 | Grande |
| Ford Mustang | 1971 | Boss 302 |
| Ford Mustang | 1971-1972 | Boss 351 |
| Ford Ranchero | 1957-1958, 1966 | Custom |
| Ford Ranchero | 1957-1971 | Base |
| Ford Ranchero | 1967-1979 | 500 |
| Ford Ranchero | 1967 | 500 XL |
| Ford Ranchero | 1968-1979 | GT |
| Ford Ranchero | 1970-1979 | Squire |
| Ford Thunderbird | 1955-1979 | Base |
| Ford Thunderbird | 1978-1979 | Town Landau |
| Ford Thunderbird | 1978 | Diamond Jubilee |
| Ford Thunderbird | 1979 | Heritage |
| Lincoln Continental | 1961-1979 | Base |
| Lincoln Mark III | 1969-1971 | Base |
| Mercury Comet | 1964-1969, 1971-1977 | Base |
| Mercury Comet | 1964-1965 | 404 |
| Mercury Comet | 1964-1965 | 202 |
| Mercury Cougar | 1967-1979 | XR-7 |
| Mercury Cougar | 1967-1973, 1977-1979 | Base |
| Mercury Cougar | 1969-1970 | Boss 302 |
| Mercury Cougar | 1969-1970 | Boss 429 |
| Mercury Cougar | 1969-1970 | Cobra Jet |
| Mercury Cougar | 1977 | Brougham |
| Mercury Cougar | 1977 | Villager |
| Mercury Grand Marquis | 1975-1978, 1980 | Base |
| Mercury Grand Marquis | 1980 | Colony Park |
Yukon's mission is to build quality parts that exceed your expectations. We achieve this through state-of-the-art product design and an in-house engineering team. Our parts are then produced by leaders in OEM manufacturing and endure rigorous testing.
Yukon Gear & Axle ("Yukon") warrants the original retail purchaser that all Yukon products will be free from defects in materials and workmanship for the periods shown herein. Yukon makes no other warranty of any kind, express or implied. All other warranties, including but not limited to an implied warranty of merchantability or fitness for a particular purpose, are excluded. This warranty is offered provided that the Yukon product has been installed and maintained in accordance with Yukon instructions, and that it has not been subject to modification, accident, abnormal use or misuse. At Yukon's discretion, this warranty may be voided if installation of Yukon product(s) occurs on vehicles with tires that exceed Yukon Maximum Recommended Tire Size.
Upon notification of a warranty claim, Yukon shall investigate the claim of defect, and, in the event of a verified defect, shall, at their sole choice, either repair the defective product, replace it, or refund the purchase price.
This warranty does not cover, and Yukon shall not be liable for, incidental or consequential damages, including loss of time, road service charges, labor charges, inconvenience, loss of vehicle use, loss of revenues, or loss or damage to personal property (including loss or damage to vehicle parts due to the failure of the Yukon product)*. In addition, this warranty does not cover, and Yukon shall not be liable for, any undertaking, representation, or agreements made by dealers or other third parties selling Yukon Gear & Axle products, except where such agreements are within the provisions of this Warranty statement. Also, this warranty does not cover damage to the axle caused by or facilitated by failure of a non-Yukon component.
This agreement offers you specific legal rights. You may also have other rights which vary from state to state.
YUKON WARRANTY BY PRODUCT
Spool
Upon notification of a warranty claim, Yukon shall investigate the claim of defect, and, in the event of a verified defect, shall, at their sole choice, either repair the defective product, replace it, or refund the purchase price.
This warranty does not cover, and Yukon shall not be liable for, incidental or consequential damages, including loss of time, road service charges, labor charges, inconvenience, loss of vehicle use, loss of revenues, or loss or damage to personal property (including loss or damage to vehicle parts due to the failure of the Yukon product)*. In addition, this warranty does not cover, and Yukon shall not be liable for, any undertaking, representation, or agreements made by dealers or other third parties selling Yukon Gear & Axle products, except where such agreements are within the provisions of this Warranty statement. Also, this warranty does not cover damage to the axle caused by or facilitated by failure of a non-Yukon component.
This agreement offers you specific legal rights. You may also have other rights which vary from state to state.
YUKON WARRANTY BY PRODUCT
Spool
- Length:As long as original purchaser owns vehicle in which Spool is originally installed
- Notes:It is normal for Spools to cause tire chatter, squeal, or scrubbing when vehicle is not moving in a straight line. Both rear tires must measure the same height from ground to top of wheel for Spool to function properly without premature wear.
- Length:As long as original purchaser owns vehicle in which Super Joint is originally installed
- Notes:Warranty coverage is for breakage of cross section or caps only. Failure by wear or galling is not covered.
- Length:One (1) Year
- Notes:Covers parts for one year against manufacturers defects.
- Length:Ten (10) Years
- Notes:Covers parts for ten years against manufacturing defects.
- Length:Ten (10) Years
- Notes:Covers parts for ten years against manufacturing defects.
- Length:Limited Lifetime
- Notes:Limited Lifetime warranty covering manufacturing defects and axle breakage for as long as you own the vehicle. This warranty is not transferable to another party. "No Questions Asked" replacement for first warranty return, however, Yukon reserves the right to either replace axle or refund original purchase price after the first warranty claim. Yukon (through RANDYS Worldwide Automotive) makes final determination on warranty considerations.
- Length:Limited Lifetime
- Notes:Limited Lifetime warranty covering manufacturing defects and axle breakage for as long as you own the vehicle. This warranty is not transferable to another party. "No Questions Asked" replacement for first warranty return, however, Yukon reserves the right to either replace axle or refund original purchase price after the first warranty claim. Yukon (through RANDYS Worldwide Automotive) makes final determination on warranty considerations.
- Length:One (1) Year
- Notes:Warrantied against manufacturing defects for one (1) year.
- Length:One (1) Year
- Notes:Exclusions apply, does not cover premature clutch wear or abuse. It is normal for Positraction differentials to cause tire chatter, squeal, or scrubbing when vehicle is not moving in a straight line. Both rear tires must measure the same height from ground to top of wheel for differential to function properly without premature wear. Limited slip additive or appropriate friction modifier must be used with oil to reduce Positraction chatter.
- Length:Six (6) Years
- Notes:All Zip Lockers come with a six (6) year warranty against manufacturer defect, including any collaterally damaged parts and associated labor, up to $2,000*, for the first two (2) years. Collaterally damaged parts must be submitted for inspection. Receipts for parts and associated labor must be submitted as well. Only claims deemed reasonable by Yukon Gear & Axle will be accepted. Offer may be discontinued without advance notice.
- Length:One (1) Year
- Notes:Covers the replacement of the unit and any collaterally damaged parts and associated labor, up to $2,000. Collaterally damaged parts must be submitted for inspection. Receipts for parts and associated labor must be submitted as well. Only claims deemed reasonable by Yukon Gear & Axle will be accepted. Offer may be discontinued without advance notice.
- Length:One (1) Year
- Notes:Covers parts for one year against manufacturing defects.
- Length:One (1) Year
- Notes:Covers parts for one year against manufacturing defects.
- Length:One (1) Year
- Notes:Covers parts for one year against manufacturing defects.
- Length:One (1) Year
- Notes:Includes BK, MK, PK, and YK. Covers parts for one year against manufacturing defects.
- Length:One (1) Year
- Notes:One year against manufacturing defects. Exclusions apply, does not cover clutch wear in limited slip differentials.
- Length:Limited Lifetime
- Notes:Limited Lifetime warranty covering manufacturing defects and breakage for as long as you own the vehicle. This warranty is not transferable to another party. "No Questions Asked" replacement for first warranty return, however, Yukon reserves the right to either replace the part or refund original purchase price after the first warranty claim. Yukon (through RANDYS Worldwide Automotive) makes final determination on warranty considerations.
- Length:Limited Lifetime
- Notes:Limited Lifetime warranty covering manufacturing defects and breakage for as long as you own the vehicle. This warranty is not transferable to another party. "No Questions Asked" replacement for first warranty return, however, Yukon reserves the right to either replace the part or refund original purchase price after the first warranty claim. Yukon (through RANDYS Worldwide Automotive) makes final determination on warranty considerations
- Length:One (1) Year
- Notes:Warrantied against manufacturing defects for one (1) year. Longer warranty is available through purchase of a Y.E.S. plan.
Installation Instructions
Click to view the Installation Instructions here
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