National 1979 Wheel Seal - Front, Front Inner or Rear Outer

National 1979 Wheel Seal for Rear Outer Applications

National 1979 is a metric wheel seal/oil seal built for rear outer differential applications that demand accurate sealing and stable fitment. With a polyacrylate sealing material and clockwise-spiral lip design, it is engineered for BMW and Nissan driveline service where seal integrity matters.

Key Features

• Part number: National 1979
• Type 47 oil seal for driveline and axle sealing service
• Polyacrylate sealing material for durable sealing performance
• Clockwise-spiral lip design for controlled sealing action
• Metric dimensions: 45.000 mm shaft ID, 75.100 mm OD, 12.000 mm width
• Housing bore: 75.000 mm
• Cross-reference example: Four Seasons 66758

Detailed Description

National 1979 is a rear outer wheel seal designed around metric dimensions and a precise sealing profile. The 1.772 inch inside diameter, 2.957 inch outside diameter, and 0.472 inch thickness support applications that require a tight seal at the differential or axle interface. National has supplied sealing solutions for decades, and this seal reflects that focus on fit, material selection, and consistent sealing geometry. It is used in BMW 188 differential applications and Nissan H190/H190A/H190B differential applications, including BMW X3, BMW X5, BMW X6, and Nissan Frontier service points listed below.

This part number, 1979, also cross-references Quality-Built 17782 for the same application.

Vehicle Fitment

• Fits 2004-2009 BMW X3, Rear Outer. Notes: Fits differential pinion bearings with 7.4016 inch ring gear and BMW 188K differential.
• Fits 2000-2009 BMW X5, Rear Outer. Notes: Fits differential pinion bearings with 7.4016 inch ring gear and BMW 188K differential.
• Fits 2008-2009 BMW X6, Rear Outer. Notes: Fits differential pinion bearings with 7.4016 inch ring gear and BMW 188K differential.
• Fits 1998-2004 Nissan Frontier, Rear Outer. Notes: with Nissan H190B Differential.
• Fits 2000-2004 Nissan Xterra, Rear Outer. Notes: with Nissan H190B Differential.
• Fits 1995-1997 Nissan Pickup, Rear Outer. Notes: with Nissan H190B Differential.
• Fits 1987-1995 BMW 325i, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1987-1995 BMW 325is, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1989-1995 BMW 525i, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1994-1995 BMW 530i, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1975-1978 BMW 530i, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1990-1994 Nissan D21, Rear Outer. Notes: with Nissan H190B Differential.
• Fits 1993 BMW 525iT, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1985-1993 BMW 535i, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1985-1992 BMW 735i, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1988-1992 BMW 735iL, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1988-1991 BMW 325iX, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1988-1991 BMW M3, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1985-1989 BMW 635CSi, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1987-1989 Nissan D21, Rear Outer. Notes: with Nissan H190A Differential.
• Fits 1982-1988 BMW 528e, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1988 BMW 535is, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1984-1987 BMW 325e, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1986-1987 BMW 325es, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1985-1986 BMW 524td, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1982-1986 Nissan 200SX, Rear Outer. Notes: with Nissan H190 Differential.
• Fits 1980-1986 Nissan 720, Rear Outer. Notes: with Nissan H190 Differential.
• Fits 1986 Nissan D21, Rear Outer. Notes: with Nissan H190 Differential.
• Fits 1983-1984 BMW 533i, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1981-1984 Nissan Maxima, Rear Outer. Notes: with Nissan H190 Differential.
• Fits 1979-1981 BMW 528i, Rear Outer. Notes: Compatible with BMW 188 Differential and 7.4016 inch Ring Gear.
• Fits 1977-1981 Nissan 810, Rear Outer. Notes: with Nissan H190 Differential.
• Fits 1968-1973 Nissan 510, Rear Outer. Notes: with Nissan H190 Differential.

Common Issues This Seal Helps Address

• Differential oil seepage at the rear outer seal area
• Fluid loss around the axle or pinion bearing interface
• Contamination entering the sealed driveline area
• Wear-related sealing failure on BMW 188 and Nissan H190-series applications
• Noise or service concerns caused by degraded seal surfaces

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal width before installation. Clean the bore and shaft sealing surface thoroughly, and inspect for grooves, corrosion, or damage that can affect seal life. Use proper seal installation practices to keep the lip square in the housing and avoid distortion of the polyacrylate sealing edge.

Quality Assurance

National has supplied premium sealing solutions for more than 75 years and continues to develop sealing designs for modern vehicle service needs. National 1979 is built to meet the dimensional and material requirements of the listed BMW and Nissan rear outer applications.