SKF 21285 Differential Pinion Seal - Rear

Reliable Differential Pinion Seal for Select GM and Isuzu Vehicles

The SKF 21285 Differential Pinion Seal is engineered to provide durable sealing performance for a range of driveline applications. Designed with precise dimensions and a longlife sealing surface, this seal is compatible with various Buick, Cadillac, Chevrolet, GMC, Hummer, Isuzu, and Saab models.

• Width: 0.500 inches for optimal fit
• Outside Diameter: 2.767 inches ensuring proper housing compatibility
• Shaft Diameter: 2.125 inches matching OEM specifications
• Longlife sealing surface type for extended service intervals
• Part number 21285 for accurate identification and replacement

Technical Details and Compatibility

The SKF 21285 Differential Pinion Seal is designed to maintain a secure seal around the pinion shaft, preventing lubricant leaks and contamination ingress. Its 0.500-inch width and 2.767-inch outside diameter provide a precise fit for differential housings on vehicles such as the Chevrolet Silverado 1500, GMC Sierra 1500, Cadillac Escalade, and Isuzu Ascender. The 2.125-inch shaft diameter matches the pinion shaft dimensions of these models, ensuring reliable sealing performance. The longlife sealing surface type enhances durability, reducing the need for frequent replacements in demanding driveline environments.

Compatible Vehicles and Applications

This differential pinion seal is compatible with a variety of GM and related vehicles, including:

• Buick Rainier
• Cadillac Escalade, Escalade ESV, Escalade EXT
• Chevrolet Avalanche, Avalanche 1500, Blazer, C1500, C1500 Suburban, Silverado 1500, Silverado 1500 HD, Suburban 1500, Tahoe, Trailblazer, Trailblazer EXT
• GMC Envoy, Envoy XL, Envoy XUV, Jimmy, K1500, K1500 Suburban, Sierra 1500, Sierra 1500 HD, Sonoma, Yukon, Yukon XL 1500
• Hummer H3
• Isuzu Axiom, Hombre, 9-7x
• Saab 9-7x

Common Issues Addressed by the SKF 21285 Seal

• Prevents differential oil leaks that can cause driveline damage
• Protects pinion shaft bearings from dirt and moisture contamination
• Maintains proper lubrication within the differential assembly
• Reduces risk of premature wear on differential components
• Helps avoid costly repairs related to seal failure

Installation Notes and Tips

• Ensure the differential housing and pinion shaft are clean and free of debris before installation
• Use appropriate tools to press the seal evenly into place without distortion
• Verify the seal orientation matches OEM specifications for proper sealing surface contact
• Check shaft diameter and housing bore to confirm compatibility with part number 21285
• Inspect surrounding components for wear or damage during replacement

Quality Assurance and Warranty

SKF manufactures the 21285 Differential Pinion Seal to meet strict quality standards, ensuring reliable performance in demanding automotive applications. The longlife sealing surface is designed to provide extended service intervals under normal operating conditions. While specific warranty terms may vary, SKF products typically come with manufacturer-backed quality guarantees to support professional installations and maintenance.