InMotion WS473823 Axle Differential Seal - Front, Rear or Rear Inner

Axle Differential Seal for BMW and More

The InMotion WS473823 axle differential seal is built with nitrile sealing material to help maintain a secure barrier at the differential pinion area. It is engineered to reduce fluid leakage and keep contaminants such as moisture and debris out of sensitive internal components.

With precise dimensions and broad vehicle coverage, this differential pinion seal supports rear differential service on select BMW applications, along with additional transmission and axle applications across Suzuki, Chevrolet, Nissan, Mazda, Ford, Kia, and Geo models.

Key Features

• Nitrile sealing material for dependable fluid control
• Inside diameter: 1.378 in.
• Outside diameter: 2.172 in.
• Thickness and width: 0.315 in.
• Housing bore: 2.165 in.
• Shaft diameter: 1.378 in.
• Designed for rear differential pinion sealing and select rear inner applications
• Part number: WS473823

Detailed Product Overview

InMotion WS473823 is a precision-fit axle differential seal intended for service work where a tight seal is critical to drivetrain reliability. The nitrile construction helps resist fluid seepage while maintaining contact around the shaft and housing bore dimensions listed above. For BMW rear differential service, this seal is listed for applications including BMW 188K and BMW 188N differential configurations, making it a practical choice for common rear differential repairs on models such as the BMW 323i, 328i, 335i, X3, X5, Z4, and related vehicles.

This part number, WS473823, also appears in transmission and axle-related fitments such as the Aisin 03-72LE transmission and rear inner seal applications. If you are servicing a BMW 328i rear differential seal, BMW X5 rear differential seal, or a Nissan Pathfinder rear inner seal, confirm the differential or transmission configuration before installation.

Common Problems This Seal Can Address

• Differential fluid leaking from the pinion area
• Contamination entering the differential housing
• Seal wear from age, heat, or fluid breakdown
• Moisture intrusion around drivetrain sealing surfaces
• Service replacement during differential maintenance

Installation Notes and Tips

Verify the differential type, housing bore, and shaft diameter before installation. Clean the sealing surface thoroughly and inspect the pinion area for wear, scoring, or contamination that could affect seal life. Proper installation depth and alignment are important for a reliable seal on BMW rear differential applications and other listed fitments.

• Compatible with select BMW 188K and 188N differential applications
• Also listed for Aisin 03-72LE transmission and rear inner seal service
• Confirm year, make, model, position, and notes against the vehicle before ordering

Quality Assurance

InMotion manufactures this seal with precision-focused construction and high-quality nitrile material to support consistent sealing performance in drivetrain service. The design emphasizes contaminant resistance and leak control for long-term differential protection.

• Fits 2006-2009 BMW 323i, rear, with BMW 188K Differential
• Fits 2007-2009 BMW 328i, rear, with BMW 188K Differential
• Fits 2007-2009 BMW 335i, rear, with BMW 188N Differential
• Fits 2004-2009 BMW X3, rear, with BMW 188K Differential
• Fits 2000-2009 BMW X5, rear, with BMW 188K Differential