SKF 21395A Differential Pinion Seal - Rear

Reliable Differential Pinion Seal for Rear Axle Applications

The SKF Differential Pinion Seal - Rear - Rear Axle (Part Number 21395A) is engineered to provide effective sealing performance for rear axle differentials. Designed specifically for select Cadillac, Chevrolet, and GMC models, this seal helps maintain drivetrain integrity by preventing fluid leaks and contamination.

• Width: 0.571 inches for precise fitment
• Outside Diameter: 3.197 inches ensuring proper sealing surface contact
• Shaft Diameter: 2.146 inches tailored for rear axle pinion shafts
• Sealing Surface Type: Polyacrylate material for enhanced durability and resistance
• Compatible with multiple GM vehicles including Escalade, Silverado 1500, and Yukon XL

About the SKF Differential Pinion Seal - Rear - Rear Axle Product Line

The Differential Pinion Seal - Rear - Rear Axle product line by SKF focuses on delivering reliable sealing solutions for rear axle differentials. This line is designed to meet OEM specifications and provide consistent performance in demanding driveline environments. The 21395A seal is part of this line, offering a balance of material quality and dimensional accuracy to support long-term axle operation.

Technical Details and Application

This differential pinion seal features a polyacrylate sealing surface, which offers resistance to heat and wear commonly encountered in rear axle assemblies. The precise dimensions—0.571 inch width, 3.197 inch outside diameter, and 2.146 inch shaft diameter—ensure a secure fit on the pinion shaft, minimizing the risk of leaks. This part is compatible with a range of GM vehicles, including Cadillac Escalade and Escalade ESV, Chevrolet Express 2500 and 3500, GMC Sierra 1500, and Yukon XL models, making it a suitable replacement for maintaining rear axle sealing integrity.

Common Issues Addressed by the SKF 21395A Differential Pinion Seal

• Prevents differential fluid leaks from the rear axle pinion shaft
• Reduces contamination ingress that can damage differential components
• Maintains proper lubrication levels within the differential housing
• Helps avoid premature wear of pinion bearings and gears
• Supports consistent drivetrain performance and noise reduction

Installation Notes and Tips

When installing the SKF 21395A differential pinion seal, ensure the mating surfaces are clean and free of debris. Proper alignment on the pinion shaft is critical to avoid seal damage. Use appropriate tools to press the seal evenly into the housing without distortion. Verify shaft diameter compatibility (2.146 inches) before installation to ensure a correct fit. Follow vehicle-specific service manual instructions for torque specifications and assembly procedures.

Quality Assurance and Warranty

SKF manufactures the 21395A differential pinion seal to meet stringent quality standards, ensuring reliable sealing performance under normal operating conditions. The polyacrylate sealing surface is selected for durability and resistance to common axle fluids. While specific warranty details are not provided, SKF products typically adhere to industry quality controls and are backed by the brand's reputation for engineering precision.