National 711112 Transfer Case Input Shaft Seal - Left

Overview of National Transfer Case Input Shaft Seal 711112

The National Transfer Case Input Shaft Seal 711112 is engineered to provide reliable sealing performance for transfer cases in select GM vehicles. Designed with a bi-directional lip and constructed from durable fluoro-elastomer material, this oil seal helps maintain optimal transfer case function in Buick, Chevrolet, GMC, Pontiac, and Saturn models.

• Flanged outside diameter: 2.421 inches (61.5 mm)
• Housing bore diameter: 2.285 inches (58.05 mm)
• Outside diameter: 2.293 inches (58.25 mm)
• Shaft diameter compatibility: 1.772 inches (45 mm)
• Seal width: 0.486 inches (12.35 mm)
• Bi-directional lip design for effective sealing
• Constructed from fluoro-elastomer for chemical and temperature resistance

Detailed Product Description

The National 711112 transfer case input shaft seal is specifically designed to fit transfer cases in various GM vehicles including Buick Acadia, Chevrolet Equinox, GMC Terrain, Pontiac Torrent, and Saturn Vue. Its bi-directional lip design ensures effective sealing against oil leaks in both rotational directions, which is critical for maintaining transfer case integrity. The fluoro-elastomer material offers enhanced resistance to heat, oil, and other automotive fluids, extending the service life of the seal under demanding conditions.

With precise dimensions such as a 2.421-inch flanged outside diameter and a 1.772-inch shaft diameter, this seal fits securely within the housing bore of 2.285 inches, ensuring a tight and reliable fit. The 0.486-inch width provides adequate sealing surface area without compromising installation space.

Applications and Common Issues Addressed

• Prevents oil leaks from the transfer case input shaft
• Reduces contamination ingress that can damage transfer case components
• Helps maintain proper lubrication within the transfer case
• Addresses wear-related seal failures in Buick Acadia and Chevrolet Equinox transfer cases
• Replaces degraded seals in GMC Terrain and Pontiac Torrent models to restore transfer case performance

Installation Notes and Tips

• Ensure the transfer case housing bore is clean and free of debris before installation
• Use appropriate tools to press the seal evenly into the housing bore to avoid damage
• Verify shaft and bore dimensions match the seal specifications for proper fit
• Lubricate the seal lip lightly with compatible oil prior to installation to reduce initial wear
• Inspect the transfer case input shaft for wear or damage before installing the new seal

Quality Assurance and Warranty

National transfer case input shaft seals are manufactured to meet OEM specifications for fit and function. The fluoro-elastomer material and bi-directional lip design contribute to consistent sealing performance under typical operating conditions. Part number 711112 is part of the National 711100 series, known for its durability and reliability in transfer case sealing applications. Warranty coverage details should be confirmed with the original equipment manufacturer or distributor.