Yukon Ford 9" Ring & Pinion Gear Set - 28-Spline
YUKYG F9-300
The Yukon Ford 9" Ring and Pinion Gear Set allows you to match axle gearing to tire size, transmission gearing, horsepower, and intended vehicle use. Available in ratios from 3.00 through 6.50, the Ford 9" can be geared for everything from highway-oriented builds to drag racing, large-tire off-road rigs, and technical rock crawlers.
The Ford 9" removable third-member design makes it one of the most adaptable differential platforms for custom and performance builds. Proper installation requires accurate pinion depth, backlash, bearing preload, and gear tooth contact pattern, making professional differential setup important for quiet operation and long gear life.
Includes:
- (1) Yukon Ford 9" Ring & Pinion Gear Set
- Available Ratios: 3.00, 3.25, 3.50, 3.70, 3.89, 4.11, 4.30, 4.56, 4.86, 5.13, 5.29, 5.43, 5.67, 6.00, 6.20, 6.33 & 6.50
Specifications
| Specification | Details |
|---|---|
| Manufacturer | Yukon Gear & Axle |
| Differential | Ford 9" |
| Ring Gear Diameter | 9.00" |
| Pinion Spline Count | 28 Spline |
| Ring Gear Bolt Count | 10 |
| Available Ratios | 3.00, 3.25, 3.50, 3.70, 3.89, 4.11, 4.30, 4.56, 4.86, 5.13, 5.29, 5.43, 5.67, 6.00, 6.20, 6.33 & 6.50 |
| Gear Design | Precision-Cut Ring & Pinion |
| Application | Street, Performance, Racing & Off-Road |
Fitment
| Make | Model | Year Range |
|---|---|---|
| Ford | Bronco | 1966–1986 |
| Ford | E-100 Econoline | 1969–1983 |
| Ford | E-150 Econoline | 1979–1988 |
| Ford | E-200 Econoline | 1969–1974 |
| Ford | E-250 Econoline | 1975–1980 |
| 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 | 1965–1979 |
| Ford | Maverick | 1970–1977 |
| Ford | Mustang | 1965–1973 |
| Ford | Ranchero | 1957–1979 |
| Ford | Thunderbird | 1955–1979 |
| Lincoln | Continental | 1958–1979 |
| Lincoln | Mark III | 1968–1971 |
| Mercury | Comet | 1964–1977 |
| Mercury | Cougar | 1967–1979 |
| Mercury | Grand Marquis | 1975–1980 |
Fitment Notes:
- Fits Ford 9" differential applications.
- Suitable for front or rear applications depending on the axle build.
- Vehicle year and model do not guarantee Ford 9" axle fitment; verify the actual differential before ordering.
- Confirm ring gear size, pinion configuration, and desired gear ratio before purchase.
- Axle swaps and aftermarket Ford 9" housings are common in performance and off-road builds, so axle identification is more important than original vehicle application.
- Professional ring and pinion setup is recommended.
FAQ
What gear ratio should I choose for a Ford 9"?
The correct ratio depends on tire diameter, transmission gearing, engine characteristics, vehicle weight, and intended use. Lower numerical ratios generally favor lower engine RPM at road speed, while higher numerical ratios provide greater torque multiplication and are commonly used with larger tires or performance-oriented builds.
What Ford 9" gear ratio is best for larger off-road tires?
Larger tires effectively make the drivetrain taller-geared, so moving to a higher numerical axle ratio can restore acceleration and low-speed control. The correct ratio should be selected using the complete drivetrain rather than tire diameter alone.
Do Ford 9" ring and pinion gears require professional setup?
Proper setup requires accurate pinion depth, backlash, bearing preload, and gear tooth contact pattern. Incorrect setup can cause gear noise, overheating, premature bearing wear, or ring and pinion failure.
Why is the Ford 9" popular for racing and off-road builds?
The removable third-member design makes the Ford 9" easy to service and highly adaptable. Its broad aftermarket support and wide range of available gear ratios make it useful for everything from street and drag applications to rock crawlers and custom off-road axles.
Can changing the gear ratio help compensate for larger tires?
Yes. Increasing tire diameter reduces the effective axle ratio. Re-gearing to a higher numerical ratio can restore torque multiplication, acceleration, and low-speed control that may have been lost after installing larger tires.