Wehrli Rear Differential Cover

2003–2018 Dodge Ram 2500 / 2003–2018 Dodge Ram 3500 with AAM 11.5 Rear Axle

WCF100113-CAT

Overview:

The Wehrli Rear Differential Cover is a premium fabricated aluminum upgrade designed specifically for Dodge Ram 2500 and 3500 trucks equipped with the AAM 11.5-inch rear axle. Engineered for heavy-duty applications, this cover provides enhanced protection and durability for your differential, making it an essential upgrade for owners of Ram trucks from 2003 through 2018. Featuring a vibrant CAT Yellow powder coat finish, it not only safeguards your axle but also adds a distinctive, rugged look to your vehicle’s undercarriage.

Ideal for enthusiasts, off-roaders, and heavy-duty truck owners, this differential cover is built to withstand demanding conditions while improving the overall reliability of your drivetrain. It is compatible with both Cummins and Duramax diesel engines, ensuring broad application across popular Ram models.

Key Features:

Designed to deliver superior protection and performance, the Wehrli Rear Differential Cover offers the following key features:

• Precision-fabricated from high-quality aluminum for strength and lightweight durability
• Custom fit for the AAM 11.5-inch rear axle found in Dodge Ram 2500 and 3500 trucks (2003–2018)
• Distinctive CAT Yellow single-stage powder coating for corrosion resistance and standout appearance
• Includes stainless steel hardware to prevent rust and ensure long-lasting fastening
• Integrated magnetic drain plug for easy maintenance and metal debris collection
• Enhanced fluid capacity to improve differential cooling and extend gear oil life
• Designed to resist impacts and protect the differential housing from rocks, debris, and rough terrain
• Compatible with both Cummins and Duramax diesel-powered Ram trucks

Construction & Design:

The Wehrli Rear Differential Cover is expertly crafted from high-grade aluminum, chosen for its excellent strength-to-weight ratio and corrosion resistance. The cover is precision-welded and machined to ensure a perfect fit on the AAM 11.5-inch rear axle housing, providing a secure seal that prevents leaks and contamination. The robust aluminum construction offers superior impact resistance compared to stock stamped steel covers, protecting your differential from damage during off-road excursions or heavy towing.

The cover’s CAT Yellow powder coating is applied in a single-stage process, delivering a durable, chip-resistant finish that stands up to harsh environmental conditions. Stainless steel bolts and a magnetic drain plug complete the design, enhancing longevity and simplifying routine maintenance.

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 equipped with the AAM 11.5 rear axle. No modifications or special tools are required, making it accessible for professional mechanics and experienced DIYers alike. The included stainless steel hardware ensures a secure and leak-free fitment.

This cover is engineered to fit a wide range of Ram trims, including Laramie, SLT, Sport, ST, SXT, TRX, and TRX4 models, ensuring broad compatibility across multiple configurations and model years.

What’s Included

• One fabricated aluminum rear differential cover with CAT Yellow powder coat
• Stainless steel mounting hardware kit
• Magnetic drain plug for fluid maintenance
• Installation instructions

Ideal For:

This differential cover is perfect for Dodge Ram 2500 and 3500 owners who demand enhanced protection for their drivetrain, especially those who use their trucks for towing, hauling, or off-road driving. It is also an excellent choice for enthusiasts looking to upgrade the durability and appearance of their rear axle assembly. Compatible with both Cummins and Duramax diesel engines, it suits a wide range of heavy-duty Ram trucks built between 2003 and 2018.

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.