National 25577 Axle Differential Bearing - Front or Rear

National 25577 Axle Differential Bearing Cone

National 25577 is a taper bearing cone built for axle differential service where precise load control matters. Manufactured from premium-grade steel, it uses crowned raceways and rollers to promote even load distribution in rear and front axle applications.

• Taper bearing cone for axle differential use
• Premium-grade steel construction
• Crowned raceways and rollers for even load distribution
• Cone bore: 1.6880 in. / 42.8750 mm
• Cone length: 1.0000 in. / 25.4000 mm
• Cone radius: 0.1400 in. / 3.5560 mm
• Part number: 25577

This bearing cone is used in differential pinion and axle bearing service on select Jaguar, Aston Martin, Chevrolet, Ford, and Jeep applications. It cross-references SKF BR25577 for the same application.

Fitment Details

• Fits 1997-2006 Jaguar XK8, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 2000-2006 Jaguar XKR, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1982-2003 Jaguar Vanden Plas, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1998-2003 Jaguar XJ8, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1995-2003 Jaguar XJR, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1972-1997 Jaguar XJ6, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1994-1996 Jaguar XJ12, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1981-1992 Jaguar XJ12, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1973-1979 Jaguar XJ12, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1976-1996 Jaguar XJS, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1989-1994 Aston Martin Virage, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1993 Jaguar XJRS, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1987-1988 Aston Martin Zagato, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1968-1971 Jaguar XJ, rear, Salisbury 4HU axle with differential pinion bearing.
• Fits 1967-1968 Chevrolet K10 Suburban, front, compatible with Spicer 44-5F axle and differential pinion repair sleeve for 8.5 inch ring gear drive axle shaft seal.
• Fits 1967-1968 Chevrolet K20 Suburban, front, 8.5-inch ring gear differential pinion on Spicer 44-5CFHD axle.
• Fits 1953-1968 Ford F-100, rear, Spicer 44-1 axle with 8.5 inch ring gear for differential pinion race.
• Fits 1964-1966 Ford F-250, front, 8.5 inch ring gear with Spicer 44-6CFHD axle.
• Fits 1964-1966 Ford F-350, front, 8.5 inch ring gear with Spicer 44-6FHD axle.
• Fits 1959-1965 Ford F-100, front, 8.5 inch ring gear with Spicer 44-F axle.
• Fits 1959-1965 Ford F-250, front, 8.5 inch ring gear with Spicer 44-F axle.
• Fits 1959-1965 Ford F-350, front, 8.5 inch ring gear with Spicer 44-F axle.
• Fits 1963-1964 Jeep Wagoneer, rear, Spicer 44-1 axle with 8.5 inch ring gear for differential pinion race.
• Fits 1955-1956 Ford Thunderbird, rear, 8.5-inch ring gear with Spicer 41 axle.
• Fits 1953-1955 Ford F-250, rear, Spicer 44-1 axle with 8.5 inch ring gear for differential pinion race.
• Fits 1953-1955 Ford F-350, rear, Spicer 44-1 axle with 8.5 inch ring gear for differential pinion race.

What It Helps Address

• Worn or noisy differential pinion bearing surfaces
• Uneven roller loading in axle service
• Excessive play in the pinion bearing area
• Service needs on Salisbury 4HU, Spicer 44, and related axle assemblies
• Rear or front axle bearing replacement on select Jaguar, Ford, Chevrolet, Aston Martin, and Jeep vehicles

Installation Notes

Verify cone bore, length, and radius against the original bearing before installation. This part is used in axle differential bearing service, so proper press-fit handling and correct bearing preload setup are important. Confirm axle type, ring gear size, and application notes for your vehicle, including Jaguar XJ6, Ford F-250, and Chevrolet K20 Suburban listings.

Quality Assurance

National manufactures this taper bearing cone with premium-grade steel and crowned raceways and rollers to support even load distribution in differential service. Part number 25577 is listed for direct application matching across the confirmed fitment set.