Moog 391 Universal Joint

Moog Universal Joint for Nissan and Subaru Drive Shafts

The Moog 391 universal joint is engineered to provide reliable driveline performance for select Nissan models including the 510, 720, D21, and Pathfinder. Designed with precision, this greaseable U-joint features four grooved round bearings to ensure smooth operation and durability.

• Compatible with Nissan 510, 720, D21, and Pathfinder models
• Part number 391 for accurate replacement
• Greaseable design with regular lube fitting in bearing
• Four grooved round bearings for enhanced bearing retention
• Bearing cap diameter: 0.985 inch (25.0 mm)
• Length measurements: 1.732 inch (44.0 mm) across both axes

Technical Specifications and Design Features

The Moog 391 universal joint is constructed with four grooved round bearings that provide secure bearing caps and reduce the risk of premature wear. Each bearing cap measures 0.985 inches (25.0 mm) in diameter, ensuring a precise fit within the driveline assembly. The U-joint is greaseable, featuring a regular lube fitting located in the bearing for easy maintenance and extended service life. Length measurements from outside groove to outside groove and inside groove to inside groove plus lock ring thickness are both 1.732 inches (44.0 mm), matching OEM specifications for Nissan and Subaru driveline applications.

Applications and Problem Solving

This universal joint is designed for use in the driveline and axle assemblies of Nissan 510, 720, D21, and Pathfinder vehicles. It addresses common driveline issues such as:

• Eliminating driveline vibrations caused by worn or damaged U-joints
• Preventing premature bearing failure with grooved round bearing caps
• Maintaining proper driveline alignment and smooth power transfer
• Reducing maintenance downtime with greaseable fittings
• Restoring OEM driveline performance and reliability

Installation Notes and Tips

When installing the Moog 391 universal joint, ensure the driveline yoke is clean and free of debris. Properly seat the bearing caps and verify the fitment matches the OEM specifications for your Nissan model. Use the grease fitting to lubricate the joint after installation and periodically during vehicle maintenance to extend the life of the U-joint. Follow torque specifications recommended by the vehicle manufacturer to avoid over-tightening.

Quality Assurance and Warranty

Moog universal joints are manufactured to meet or exceed OEM standards for durability and performance. The 391 U-joint undergoes rigorous quality control to ensure precise fit and function. This part is backed by Moog's limited warranty, providing coverage against defects in materials and workmanship under normal use conditions.