National 25520 Manual Transmission Output Shaft Race - Front Inner or Rear

National 25520 Manual Transmission Output Shaft Race

National 25520 is a taper bearing cup for manual transmission applications that require a precise output shaft race. Manufactured from premium-grade steel, it uses a crowned raceway to promote even load distribution and consistent bearing support in service.

Key Features

• Part number: 25520
• Part type: manual transmission output shaft race / taper bearing cup
• Premium-grade steel construction
• Crowned raceway for even load distribution
• Cup bore: 3.2650 in. / 82.9310 mm
• Cup length: 0.7500 in. / 19.0500 mm
• Cup radius: 0.0310 in. / 0.7870 mm
• National taper bearing cup engineered for manual transmission service

Product Details

This National 25520 taper bearing cup is used in manual transmission assemblies where the output shaft bearing race must maintain accurate contact and stable load transfer. It is listed for a wide range of performance and classic applications, including 2015-2019 Ford Mustang, 2016-2019 Chevrolet Camaro, and 2009-2015 Dodge Challenger, along with Tremec T56 and Tremec 6060 transmission applications in select vehicles. This part cross-references Monroe Shocks & Struts 210009 for the same application.

National 25520 also appears in fitment for Cadillac CTS, Cadillac ATS, Chevrolet SS, Dodge Viper, Chevrolet Corvette, Pontiac G8, Aston Martin Vanquish, Dodge Ram 1500, Dodge Ram 2500, and Dodge Ram 3500 applications when equipped with the specified transmission or axle configuration. If you are searching for a manual transmission output shaft race for a Ford Mustang, Chevrolet Camaro, or Dodge Challenger, this part number is a direct reference point for fitment verification.

Common Problems This Part Can Address

• Excessive bearing play at the output shaft race
• Rough or noisy manual transmission operation
• Uneven bearing load on the taper bearing cup
• Wear at the bearing contact surface
• Transmission rebuilds requiring a replacement race

Installation Notes and Tips

Confirm the transmission model, bearing dimensions, and cup bore before installation. Match the application notes carefully, especially for Tremec T56, Tremec 6060, Borg-Warner T56, Borg-Warner T45, Getrag G360, and New Process 5600 listings. Clean the bore and seating surface thoroughly, and inspect the mating bearing components for wear before assembly.

Quality Assurance

National manufactures this taper bearing cup with premium-grade steel and a crowned raceway to support even load distribution. The part number 25520 is backed by National’s OE-style bearing component engineering for manual transmission service.