National 307-FF Manual Transmission Output Shaft Bearing

Overview of National 307-FF Manual Transmission Output Shaft Bearing

The National 307-FF is a precision-engineered manual transmission output shaft bearing designed for select Chrysler, Dodge, and Jeep models. This bearing supports smooth rotational movement and durability in transmissions of vehicles like the Sebring, Stratus, and Wrangler.

• Single row radial ball bearing design
• Inner race bore diameter of 1.378 inches (35 mm)
• Outer race outside diameter of 3.150 inches (80 mm)
• Width of 0.827 inches (21 mm) for compact fitment
• Inner and outer race radius of 0.060 inches (1.52 mm)
• Series 300, Type A-9 specification

Technical Specifications and Design Details

The National 307-FF bearing features a single row radial ball bearing design optimized for manual transmission output shafts. With an inner race bore of 1.378 inches (35 mm) and an outer diameter of 3.150 inches (80 mm), it provides a precise fit for the transmission components. The bearing width of 0.827 inches (21 mm) ensures proper load distribution and stability during operation. Both inner and outer races have a radius of 0.060 inches (1.52 mm), contributing to smooth rotation and reduced wear. This bearing is part of National's Series 300 and meets Type A-9 standards, ensuring compatibility and performance within specified vehicle transmissions.

Compatible Vehicles and Applications

This manual transmission output shaft bearing is compatible with the following vehicles:

• Chrysler Sebring manual transmissions
• Dodge Stratus manual transmissions
• Jeep Wrangler manual transmissions

Using the National 307-FF bearing in these models helps maintain transmission efficiency and reliability.

Common Issues Addressed by the 307-FF Bearing

• Excessive transmission noise due to worn bearings
• Vibration or rough shifting in manual transmissions
• Premature bearing failure from improper fit or wear
• Transmission output shaft misalignment
• Reduced transmission lifespan caused by bearing degradation

Installation Notes and Tips

Proper installation of the National 307-FF bearing is critical for optimal performance. Ensure the transmission output shaft and housing are clean and free of debris before installation. Use appropriate tools to press the bearing into place without applying excessive force that could damage the races. Verify correct alignment and clearance according to vehicle service manuals for Chrysler Sebring, Dodge Stratus, or Jeep Wrangler models. Lubricate the bearing as specified to prevent premature wear.

Quality Assurance and Warranty

National bearings are manufactured to meet strict quality standards, including dimensional accuracy and material integrity. The 307-FF bearing undergoes rigorous testing to ensure durability and performance in manual transmission applications. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability.