Wehrli Rear Differential Cover

Fits Most Dodge/Ram 6.7L Diesel/5.9L Diesel (03-18)

WCF100113-RED

Overview:

The Wehrli Rear Differential Cover is a premium fabricated aluminum upgrade designed specifically for the AAM 11.5-inch rear axle found in Dodge Ram 2500 and 3500 trucks from 2003 through 2018. Engineered to provide superior protection and enhanced durability, this differential cover is ideal for truck owners who demand rugged reliability and improved serviceability for their heavy-duty vehicles. Featuring a vibrant red two-stage powder coat finish, it not only strengthens the rear differential housing but also adds a custom aesthetic touch to your truck’s undercarriage.

Whether you’re a professional contractor, off-road enthusiast, or daily driver, this cover offers peace of mind by guarding your differential against impacts, debris, and wear. Its robust construction and thoughtful design make it a smart upgrade for Dodge Ram owners running Cummins or Duramax diesel engines, ensuring your drivetrain stays protected under demanding conditions.

Key Features:

Designed with precision and durability in mind, the Wehrli Rear Differential Cover offers the following key features:

• Custom fabricated from high-strength aluminum for superior impact resistance and heat dissipation
• Two-stage red powder coat finish for long-lasting corrosion protection and a striking appearance
• Compatible with AAM 11.5-inch rear axles used in Dodge Ram 2500 and 3500 models (2003–2018)
• Includes stainless steel hardware and a magnetic drain plug for easy maintenance and contamination control
• Engineered to increase fluid capacity, improving cooling and extending differential life
• Precision CNC-machined sealing surface ensures a leak-free fit with OEM gaskets or RTV sealant
• Designed to fit trucks equipped with Duramax or Cummins diesel engines without modification
• Enhances structural rigidity of the differential housing for added drivetrain protection

Construction & Design:

The Wehrli Rear Differential Cover is crafted from premium-grade aluminum, chosen for its excellent strength-to-weight ratio and thermal conductivity. This material helps dissipate heat generated by the differential during heavy towing or off-road use, reducing the risk of overheating and premature wear. The cover is precision fabricated using advanced CNC machining techniques to ensure perfect fitment and a smooth sealing surface.

Its vibrant red powder coat finish is applied in a two-stage process, providing a durable, chip-resistant coating that stands up to harsh environmental conditions and road debris. Stainless steel fasteners are included to prevent rust and corrosion, ensuring long-term reliability and ease of service. The integrated magnetic drain plug captures metal particles, helping to maintain clean gear oil and prolong the life of your differential components.

Installation & Fitment:

Installation of the Wehrli Rear Differential Cover is straightforward and designed to be a direct bolt-on replacement for the factory cover on Dodge Ram 2500 and 3500 trucks from 2003 to 2018. No modifications to the axle or vehicle are required. The included stainless steel hardware and detailed instructions make the process simple for experienced DIYers or professional installers alike.

It is recommended to drain the differential fluid before removal and refill with the appropriate gear oil after installation. The cover’s design accommodates OEM gaskets or RTV sealants to ensure a secure, leak-free seal. This product fits trucks equipped with the AAM 11.5-inch rear axle, commonly found in models powered by Cummins and Duramax diesel engines.

What's Included:

• One fabricated aluminum rear differential cover with red powder coat finish
• Stainless steel mounting hardware kit
• Magnetic drain plug installed
• Installation instructions

Ideal For:

This differential cover is perfect for Dodge Ram 2500 and 3500 owners who require enhanced protection for their rear axle during heavy-duty towing, hauling, or off-road driving. It is especially suited for trucks equipped with Cummins or Duramax diesel engines that demand reliable drivetrain components capable of withstanding extreme conditions. Whether upgrading for durability, maintenance ease, or custom styling, this cover delivers lasting value and peace of mind.

Wehrli Custom Fabrication (WCFab) is a diesel performance and metal fabrication specialist building upgraded hard parts and engineered solutions for Duramax, Cummins, and Power Stroke trucks. Known for high-quality fabrication and truck-focused product development, WCFab supports everything from tow rigs to race-oriented diesel builds where durability, airflow, and heat management matter.