Product Overview

The differential shaft seal, OEM number A1643370059, is fitted to the front differential on the Mercedes-Benz M-Class (W164), GL-Class (X164, including GL450 and GL550), and R-Class (W251, including R350), covering the 2006-2013 production run on 4MATIC all-wheel-drive models. Since this seal spans three closely related Mercedes-Benz SUV platforms sharing the same front differential design, it's a useful part number for distributors serving Mercedes-Benz driveline repair demand.

A worn or failing differential shaft seal typically shows up as visible gear oil leaks near the differential, low differential fluid level, or gear noise from accelerated wear caused by low lubrication. GSK Auto manufactures this seal to OEM specification at our Ningbo, China facility, with every unit tested before packing. We supply at wholesale volume with low MOQ and support private label packaging, with our team available to confirm fitment before shipping.

Replacement OEM Numbers

Cross-Reference OEM Number

1643370059, A1643370159, 1643370049, 1643370159, Corteco 01036511B, Timken KLM503311, KLM503349

(Confirm against your VIN or chassis code before ordering — these are commonly listed cross-references for this application, not a guarantee of exact fitment for every variant.)

What Is a Differential Shaft Seal?

Function: The differential shaft seal seals the point where the axle shaft or pinion enters the differential case, retaining gear oil inside the differential while keeping dirt and moisture out.

Working Principle: A spring-loaded lip seal maintains contact with the rotating shaft, creating a sealed barrier that contains pressurized gear oil while allowing the shaft to rotate freely.

Importance: On a 4MATIC all-wheel-drive platform, a properly sealed differential is essential for maintaining correct gear oil levels and preventing accelerated wear to internal differential components.

Common Failures & Signs: Gear oil leaking near the differential case. Low differential fluid level from a slow leak. Gear noise or whining from the differential due to low lubrication. Visible oil staining on the underside of the vehicle near the front axle.

Key Features

OEM-standard fitment - matches factory dimensions and specification for the A1643370059 application, front differential.

Durable seal material - built to withstand sustained rotation and gear oil exposure.

Excellent fitment - direct replacement, no modification required.

Tested before shipment - every unit checked before packing.

Reliable performance - restores factory sealing and prevents gear oil leaks.

Benefits

Importers - covers front differential seal demand across the ML, GL, and R-Class from one part number.

Wholesalers - steady demand from a well-established Mercedes-Benz SUV platform family.

Repair Shops - tested unit reduces comeback risk on a differential service.

Distributors - private label packaging available for building a branded catalog.

End Customers - restored differential sealing and protection against gear wear.

Packaging & Shipping

Standard export cartons. Customized packaging available for distributor branding. OEM-style and private label printing on request. Container loading handled directly, with mixed-SKU consolidation for smaller orders. Worldwide shipping to Europe, North America, South America, the Middle East, Africa, and Southeast Asia.

Why Choose GSK Auto

GSK Auto manufactures factory-direct, keeping pricing tied to production cost. This seal is built to OEM specification and tested before packing. We support low MOQ, private label packaging, and worldwide shipping, with our technical team available to confirm fitment before you order.

Call to Action

Sourcing front differential shaft seals for the Mercedes-Benz ML, GL, or R-Class? Contact GSK Auto for a wholesale quote, catalog, or OEM/private label cooperation.