Moog 331A Universal Joint

Moog 331A Universal Joint Overview

The Moog 331A universal joint is engineered for driveline reliability in select GM and Dodge vehicles. Designed with greaseable round plain bearings, this U-joint supports smooth power transfer and long service life in models like the Chevrolet Silverado 1500 and GMC Sierra 1500.

• Greaseable design with regular lube fitting in cross for easy maintenance
• Four round plain bearing caps measuring 1.188 inches (30.2 mm) diameter
• Length from outside bearing to outside bearing: 3.625 inches (92.1 mm)
• Compatible with Spicer 1350 (SPL30) OE series
• Fits multiple GM and Dodge trucks and SUVs including Cadillac Escalade and Ram 1500

Technical Specifications and Features

The Moog 331A universal joint features four round plain bearings with bearing cap diameters precisely sized at 1.188 inches (30.1-30.2 mm). Both length axes measure 3.625 inches (92.1 mm) from outside bearing to outside bearing, ensuring proper fitment and alignment. The bearing caps are designed for durability and smooth rotation, while the greaseable cross with a regular lube fitting allows for routine lubrication to extend component life. This U-joint is part of the Spicer 1350 (SPL30) OE series, matching original equipment specifications for reliable driveline performance.

Compatible Vehicles and Applications

This universal joint is compatible with a range of GM and Dodge vehicles, including:

• Cadillac Escalade, Escalade ESV, Escalade EXT
• Chevrolet Avalanche, Silverado 1500, Silverado 1500 Classic, Suburban 1500, Suburban 2500, Tahoe, Trailblazer
• GMC Envoy, Sierra 1500, Sierra 1500 Classic, Yukon, Yukon XL 1500, Yukon XL 2500
• Dodge Ram 1500, Ram 2500, Ram 3500
• Hummer H2, H3, H3T
• Saab 9-7x

Common Issues Addressed by Moog 331A Universal Joint

• Eliminates driveline vibrations caused by worn or damaged U-joints
• Prevents premature bearing wear with greaseable design
• Restores smooth rotational movement in the drive shaft
• Reduces noise and drivetrain binding in off-road or heavy-duty use
• Maintains proper alignment and power transfer in 4WD and AWD systems

Installation Notes and Tips

When installing the Moog 331A universal joint, ensure the grease fitting is accessible for routine lubrication. Verify the bearing cap diameters and length measurements match the original U-joint to avoid fitment issues. Use proper tools to press the bearing caps evenly to prevent damage. Regularly lubricate the joint through the lube fitting to maintain optimal performance and extend service life.

Quality Assurance and Warranty

Moog universal joints are manufactured to meet or exceed OEM standards, ensuring durability and reliable operation. The 331A part number is backed by Moog's quality control processes and typically includes a limited warranty against defects in materials and workmanship. Refer to Moog's official warranty documentation for specific coverage details.