Timken LM78349 Differential Pinion Bearing - Front Outer, Rear or Rear Inner

Timken LM78349 Differential Pinion Bearing Overview

The Timken LM78349 differential pinion bearing is engineered for precision and durability in driveline applications. Designed to meet the specific requirements of Audi and Maserati models, this bearing ensures reliable performance and smooth operation in your vehicle's differential system.

• Inside diameter options: 1.377 inches and 34.99 millimeters for precise fitment
• Cone width of 0.669 inches (17.00 mm) for optimal load distribution
• Manufactured to exacting standards for consistent quality and durability
• Compatible with select Audi 80, 90, 100 models and Maserati Biturbo, Spyder, 228i, 430i
• Part number LM78349 for accurate identification and replacement

Technical Specifications and Design Details

The Timken LM78349 differential pinion bearing features a dual inside diameter measurement, listed as 1.377 inches and 34.99 millimeters, ensuring compatibility with specific differential assemblies. The cone width measures 0.669 inches (17.00 mm), providing the necessary surface area to support pinion gear loads effectively. The cone radius is zero, indicating a flat cone surface designed for stable seating within the differential housing. These precise dimensions contribute to maintaining proper gear alignment and reducing wear over time.

Compatible Vehicles and Applications

This differential pinion bearing is compatible with a range of Audi and Maserati vehicles, including Audi 80, 90, and 100 series, as well as Maserati Biturbo, Spyder, 228i, and 430i models. Using the Timken LM78349 bearing in these vehicles helps maintain drivetrain integrity and supports smooth differential operation under various driving conditions.

Common Issues Addressed by Timken LM78349

• Eliminates excessive play or looseness in the differential pinion gear
• Reduces noise and vibration caused by worn or damaged bearings
• Prevents premature wear of differential components due to improper bearing fit
• Supports proper gear mesh alignment to avoid differential gear damage
• Enhances overall driveline reliability and performance

Installation Notes and Tips

• Ensure the differential housing and pinion gear surfaces are clean and free of debris before installation
• Verify bearing dimensions against OEM specifications for proper fit
• Use appropriate tools to press the bearing into place without causing damage
• Check for correct preload and bearing seating during assembly
• Consult vehicle service manuals for torque specifications and installation procedures

Quality Assurance and Warranty

Timken bearings are manufactured under strict quality control standards to meet or exceed OEM requirements. The LM78349 differential pinion bearing undergoes rigorous testing to ensure durability and performance in demanding automotive applications. While specific warranty details may vary, Timken typically offers coverage against manufacturing defects, providing confidence in the product's reliability for Audi and Maserati driveline repairs.