Motive Gear F890380 Differential Ring & Pinion For Ford 9" Rear Axle, Gear Ratio: 3.80, 10-Bolt, 28 Spline 10 Pinion & 38 Ring Tooth - Fits 1955–1986 Ford & Mercury Cars/Trucks Replaces Ford M4209A380

Short Summary: The Motive Gear F890380 is a precision-engineered differential ring and pinion gear set designed for Ford 9" rear axles with a 3.80 gear ratio. Built from durable 8620 steel, this high-performance gear set delivers reliable power transfer and is ideal for vintage Ford and Mercury muscle cars, trucks, and street machines from 1955 to 1986.Key FeaturesAxle Fitment: Ford 9" (Dropout Style)Gear Ratio: 3.80Pinion Gear Tooth Count: 10Ring Gear Tooth Count: 38Pinion Shaft Diameter: 1.313"Pinion Spline Count: 28Ring Gear Outside Diameter: 9"Material: 8620 SteelRing Gear Bolt Quantity: 10Cover Bolt Quantity: Dropout StyleRing Gear Rotation: StandardIncludes: Ring & Pinion Gear SetVehicle CompatibilityFord1966–1986 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 NumbersFord: M4209A380Warranty & Quality AssuranceBacked by Motive Gear’s 2-Year or 100,000-Mile warranty, this gear set delivers proven strength, quiet operation, and high performance. Trusted by enthusiasts and professionals alike, Motive Gear products meet or exceed OEM specifications for quality and dependability.

• High-performance 3.80 gear ratio ring & pinion set engineered for Ford 9" rear axles with standard rotation; ideal for muscle cars, hot rods, and vintage trucks.
• Built from premium 8620 steel for long-term durability and consistent torque transfer; ideal for street or mild performance builds.
• Technical specs: 28-spline pinion, 1.313" shaft diameter, 10 pinion teeth, 38 ring teeth, 9" ring gear OD, 10 ring bolts, dropout-style carrier.
• Compatible with 1955–1986 Ford and Mercury vehicles including Bronco, Mustang, F-100/F-150, Ranchero, Fairlane, Cougar, Torino, and Continental.
• Direct replacement for OEM Ford M4209A380 gear set; includes 2-Year / 100,000-Mile Motive Gear warranty for peace of mind.