National 25821 Manual Transmission Output Shaft Race

Overview of National 25821 Manual Transmission Output Shaft Race

The National 25821 manual transmission output shaft race is a precision-engineered taper bearing cup designed for reliable performance in various manual transmission systems. This component is compatible with multiple vehicle makes and models, including Chevrolet Camaro, Ford Mustang, Jeep Cherokee, and Nissan 300ZX, ensuring proper fit and function.

• Cup Bore Diameter: 2.8750 inches (73.0250 mm)
• Cup Length: 0.7500 inches (19.0500 mm)
• Cup Radius: 0.0310 inches (0.7870 mm)
• Part Type: Manual Transmission Output Shaft Race (Taper Bearing Cup)
• Part Number: 25821 by National

Detailed Product Description and Specifications

The National 25821 output shaft race is a taper bearing cup designed to support the manual transmission output shaft by providing a smooth, durable surface for bearing operation. With a cup bore of 2.8750 inches (73.0250 mm) and a cup length of 0.7500 inches (19.0500 mm), this component ensures precise alignment and load distribution within the transmission assembly. The cup radius of 0.0310 inches (0.7870 mm) contributes to the bearing’s ability to handle radial and axial loads effectively, reducing wear and extending transmission life.

This part is engineered to meet OEM specifications for a range of vehicles, including Chevrolet Blazer, Dodge Dart, Ford Bronco, GMC Jimmy, Isuzu Amigo, Jeep CJ7, Mercury Cougar, Nissan 280ZX, and Pontiac Firebird. The National 25821 is suitable for manual transmission repairs and rebuilds where the output shaft race requires replacement to restore proper bearing function.

Compatible Vehicles and Applications

• Chevrolet Camaro, Blazer, and S10 models
• Ford Mustang, Bronco, and F-100 trucks
• Jeep Cherokee, CJ5, CJ7, and Wagoneer
• Nissan 280ZX and 300ZX sports cars
• Dodge Dart and Plymouth models

Common Issues Addressed by National 25821 Output Shaft Race

• Excessive bearing noise or roughness in manual transmission output shaft
• Premature bearing wear due to damaged or worn races
• Transmission vibration caused by misaligned or deteriorated bearing surfaces
• Leaking or failing transmission seals related to bearing failure
• Difficulty shifting or abnormal transmission operation linked to output shaft bearing issues

Installation Notes and Tips

When installing the National 25821 output shaft race, ensure the transmission is clean and free of debris to prevent premature wear. Use appropriate tools to press the taper bearing cup evenly into the transmission housing without damaging the cup bore or radius. Verify correct alignment and seating depth according to vehicle-specific service manuals. Proper lubrication of the bearing surfaces during assembly is essential for optimal performance.

Quality Assurance and Warranty Information

National manufactures the 25821 output shaft race to meet or exceed OEM standards for durability and fitment. Each part undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details are not provided, National products typically come with a limited warranty against defects in materials and workmanship. Consult the product documentation or manufacturer for exact warranty terms.