National 710928 Automatic Transmission Extension Housing Seal

Overview of National 710928 Automatic Transmission Extension Housing Seal

The National 710928 automatic transmission extension housing seal is engineered to provide reliable sealing performance for a range of vehicles including Cadillac, Chevrolet, Dodge, Ford, GMC, Hummer, Isuzu, Jeep, and Ram models. Designed with precision dimensions and durable polyacrylate material, this oil seal helps maintain transmission integrity and prevent fluid leaks.

• Inside diameter: 1.938 inches (49.230 mm)
• Outside diameter: 2.685 inches (68.200 mm)
• Thickness/width: 0.500 inches (12.700 mm)
• Sealing material: Polyacrylate for enhanced durability
• Compatible with multiple truck and SUV models from 1500 series to full-size pickups and SUVs

Detailed Product Description and Specifications

The National 710928 is part of the 710900 series of automatic transmission extension housing seals. It features a polyacrylate sealing material known for its resistance to heat and transmission fluids, ensuring a tight seal around the shaft and housing bore. The seal’s inside diameter measures 1.938 inches (49.230 mm), matching the shaft size, while the outside diameter is 2.685 inches (68.200 mm), fitting precisely into the housing bore of 2.680 inches (68.070 mm). With a thickness of 0.500 inches (12.700 mm), this seal provides a robust barrier against leaks and contamination.

Compatible Vehicle Fitment

This transmission extension housing seal is compatible with a wide range of vehicles, including but not limited to:

• Cadillac Escalade
• Chevrolet Blazer, Tahoe, S10, and Silverado 1500-3500 series
• Dodge Ram 1500, 2500, 3500, Dakota, Durango
• Ford F-150, F-250, F-350, Bronco
• GMC Sierra and Yukon
• Hummer H1
• Isuzu Hombre, Pickup models
• Jeep Cherokee, Grand Cherokee, Wrangler, Liberty, TJ

Common Applications and Issues Addressed

• Prevents automatic transmission fluid leaks at the extension housing
• Maintains proper sealing to avoid contamination and premature wear
• Reduces risk of transmission damage caused by fluid loss
• Helps maintain transmission pressure and performance
• Replaces worn or damaged seals in older or high-mileage vehicles

Installation Notes and Tips

• Ensure the housing bore and shaft are clean and free of debris before installation
• Use appropriate tools to press the seal evenly into the housing bore without distortion
• Verify the seal orientation matches the original part for proper sealing
• Check shaft surface for wear or damage that could affect seal performance
• Consult vehicle service manual for torque specifications and installation procedures

Quality Assurance and Warranty

National transmission seals are manufactured to meet OEM specifications, using high-quality polyacrylate materials for durability and resistance to transmission fluids and heat. The 710928 seal undergoes rigorous quality control to ensure dimensional accuracy and sealing performance. While specific warranty terms may vary, National typically offers a limited warranty against defects in material and workmanship, providing confidence in the product’s reliability.