EXCEL F9550 Differential Ring & Pinion For Ford 9" Gear Ratio 5.50, 10-Bolt, 28 Spline 6 Pinion & 33 Ring Tooth -Fits Bronco, F-100, Mustang Thunderbird Lincoln Replaces F9-550, YG F9-550, 69-0550-1

Short Summary: The EXCEL from Richmond F9550 ring and pinion gear set is precision-engineered for Ford 9" rear ends, offering a 5.50 gear ratio for maximum torque and acceleration. Ideal for off-road, street/strip, and towing builds requiring aggressive gearing and reliable strength.Key FeaturesAxle Fitment: Ford 9" Dropout-Style DifferentialGear Ratio: 5.50Pinion Spline Count: 28Pinion Shaft Diameter: 1.313 InchesPinion Tooth Count: 6Ring Gear Tooth Count: 33Ring Gear Bolt Quantity: 10Ring Gear Outside Diameter: 9 InchesRing Gear Material: 8620 SteelRotation: StandardVehicle CompatibilityFits Ford 9" rear axles found in a wide range of Ford, Lincoln, and Mercury vehicles across multiple decades. Ideal for classic restorations, muscle cars, and custom performance applications.Ford1966–1986 Bronco1969–1983 E-100 Econoline1975–1983 E-100 Econoline Club Wagon1975–1986 E-150 Econoline1975–1986 E-150 Econoline Club Wagon1969–1974 E-200 Econoline1975–1983 F-1001975–1986 F-1501957–1970 Fairlane1959–1967 Galaxie1962–1974 Galaxie 5001972–1976 Gran Torino1975–1980 Granada1965–1979 LTD1977–1979 LTD II1970–1977 Maverick1965–1973 Mustang1957–1979 Ranchero1955–1979 Thunderbird1968–1976 TorinoLincoln1958–1979 Continental1968–1971 Mark III1977–1980 VersaillesMercury1964–1969 Comet1971–1977 Comet1967–1979 Cougar1975–1978 Grand Marquis1963–1970 Marauder1967–1978 Marquis1968–1976 MontegoReplaces OEM & Aftermarket Part NumbersEXCEL: F9550Richmond Gear: 69-0550-1Motive Gear: F9-550Yukon Gear & Axle: YG F9-550Ford OEM: N/A (Aftermarket Performance Upgrade)Warranty & Quality AssuranceBacked by a 1-Year / 50,000-Mile Warranty, EXCEL from Richmond ring & pinion sets are crafted from premium 8620 steel for long-lasting strength and quiet performance. Engineered for superior fitment and durability under high torque loads.

• Precision-Engineered 5.50 Gear Ratio: Designed for high torque and performance, this EXCEL from Richmond ring and pinion set delivers enhanced acceleration and towing capabilities in Ford 9" rear differentials.
• Built for Strength & Durability: Manufactured from premium 8620 steel for superior wear resistance. Features 6 pinion teeth, 33 ring teeth, and 1.313" pinion shaft diameter for rugged performance.
• Direct Fitment for Ford 9" Dropout Axles: Compatible with 28-spline pinion shafts and 10-bolt ring gear designs. Standard rotation setup for street, strip, and off-road use.
• Broad Classic Ford & Lincoln Application Coverage: Fits 1955–1986 Bronco, Mustang, F-100, Fairlane, Galaxie, Thunderbird, Ranchero, Continental, Cougar, and more with Ford 9" axles.
• Trusted Quality Backed by Warranty: Covered by a 1-year or 50,000-mile warranty. Ideal upgrade or replacement for high-performance builds needing bulletproof traction and reliability.