National 370001A Wheel Seal - Front or Front Inner

National 370001A Wheel Seal Overview

National 370001A is an oil bath wheel seal built for driveline and axle sealing applications where consistent lubricant retention matters. It uses nitrile material and National’s Dynamic Edge design to help maintain a reliable seal in demanding service conditions.

With a 3.500 inch shaft diameter, 4.842 inch housing bore, and 4.873 inch outside diameter, this seal is specified for precise dimensional matching. It is a direct-fit option for select heavy-duty and industrial-style applications, including vehicle platforms that use National 370001A wheel seal specifications.

Key Features

• Wheel seal / oil bath seal for driveline and axle sealing systems
• Nitrile construction for sealing performance in lubricant-exposed environments
• Dynamic Edge footnote design for improved sealing contact
• Housing bore: 4.842 in. (122.990 mm)
• Shaft diameter: 3.500 in. (88.900 mm)
• Outside diameter: 4.873 in. (123.774 mm)
• Width: 0.925 in. (23.500 mm)
• Installation tool reference: RD307

Detailed Description

National 370001A is part of the 370000 series and is engineered as an oil bath seal for axle and wheel-end service. The seal dimensions are critical for proper housing fit and shaft contact, making it important to verify the housing bore, shaft diameter, and overall width before installation. National has focused on sealing solutions for decades, and this part reflects that experience with a design intended for modern vehicle service requirements. This part cross-references Stant 48078 and Continental 64414 for the same application. For technicians searching wheel seal replacement options for Ford, Chevrolet, and GMC applications, National 370001A is a relevant OE-style service part to compare by dimensions and application data.

Common Problems This Seal Can Address

• Gear oil or lubricant leakage at the wheel end
• Contamination entering the axle or hub area
• Seal wear from heat, friction, or age
• Loss of proper oil bath retention in sealed assemblies
• Noise or service issues related to compromised sealing surfaces

Installation Notes and Tips

Confirm shaft diameter, housing bore, outside diameter, and width against the original seal before installation. Use the specified installation tool RD307 where required, and inspect the shaft and bore surfaces for scoring, corrosion, or debris that could affect sealing. Clean the sealing area thoroughly and verify the seal seats evenly during installation. For fitment research, compare National 370001A against the original application data on Ford, Chevrolet, and GMC wheel-end assemblies.

Quality Assurance

National has built its reputation on premium sealing solutions for more than 75 years, with product development focused on keeping pace with current vehicle requirements. The 370001A wheel seal reflects that sealing expertise through application-specific dimensions and a nitrile sealing material selected for oil bath service.