National LM102910 Manual Transmission Countershaft Race

Overview of National LM102910 Manual Transmission Countershaft Race

The National LM102910 is a precision-engineered manual transmission countershaft race designed to meet the demanding requirements of various vehicle makes and models. This taper bearing cup is essential for maintaining smooth transmission operation in vehicles such as Chevrolet Blazer, Ford F-150, and Toyota 4Runner.

• Part Number: LM102910
• Brand: National
• Category: Manual Transmission Components
• Cup Bore Diameter: 2.8910 inches (73.4310 mm)
• Cup Length: 0.6200 inches (15.7480 mm)
• Cup Radius: 0.0310 inches (0.7870 mm)
• Part Description: Taper bearing cup for countershaft race

Technical Specifications and Features

The LM102910 manual transmission countershaft race features a cup bore diameter of 2.8910 inches (73.4310 mm), providing a precise fit for the countershaft bearing assembly. The cup length measures 0.6200 inches (15.7480 mm), ensuring proper seating and alignment within the transmission housing. Additionally, the cup radius of 0.0310 inches (0.7870 mm) supports optimal bearing contact and load distribution, which is critical for transmission durability and performance.

Compatible Vehicles and Applications

This National taper bearing cup is compatible with a wide range of vehicles, including but not limited to Chevrolet Blazer, Ford F-150, Toyota 4Runner, Dodge Ram 1500, and Jeep CJ7. It is suitable for manual transmission systems in trucks, SUVs, and passenger cars from manufacturers such as Chevrolet, Ford, Toyota, Dodge, Jeep, and more. The LM102910 is designed to replace worn or damaged countershaft races in these models, helping restore proper transmission function.

Common Issues Addressed by LM102910

• Eliminates excessive play or looseness in the manual transmission countershaft
• Prevents premature bearing wear caused by damaged or worn races
• Reduces transmission noise and vibration related to bearing misalignment
• Restores smooth gear engagement and shifting performance
• Helps avoid costly transmission damage due to improper bearing support

Installation Notes and Tips

When installing the National LM102910 countershaft race, ensure the transmission is clean and free of debris. Use appropriate tools to press the taper bearing cup evenly into the transmission housing bore to avoid distortion. Verify the cup bore and length dimensions match the original equipment specifications for your vehicle model. Proper lubrication of the bearing surfaces during installation is recommended to facilitate smooth operation and prevent premature wear.

Quality Assurance and Warranty Information

National manufactures the LM102910 manual transmission countershaft race to meet industry standards for durability and precision. This part undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects, providing confidence in the reliability of this transmission component.