Wehrli Rear Differential Cover

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

WCF100113-GM

Overview:

The Wehrli Gun Metal Rear Differential Cover is a premium upgrade designed specifically for Dodge Ram 2500 (2003–2010) and Ram 2500/3500 (2011–2018) models equipped with the AAM 11.5 rear axle. Crafted from fabricated aluminum, this differential cover offers enhanced durability and protection compared to the factory steel covers. It is an ideal choice for truck owners who demand superior strength and reliability for their heavy-duty applications, including towing, hauling, and off-road use.

Engineered to withstand the rigors of demanding driving conditions, the Wehrli cover helps maintain optimal differential performance by improving fluid capacity and heat dissipation. Its custom gun metal powder-coated finish not only provides corrosion resistance but also adds a sleek, rugged appearance under your vehicle.

Key Features:

This differential cover combines advanced design and quality materials to deliver lasting performance and protection. Key features include:

• Fabricated from high-strength aluminum for superior impact resistance and weight savings
• Custom gun metal single-stage powder coating for corrosion protection and a durable finish
• Designed specifically for the AAM 11.5 rear axle found in Dodge Ram 2500/3500 and compatible GM HD trucks
• Includes stainless steel hardware and a magnetic drain plug to capture metal debris and simplify maintenance
• Increased fluid capacity to improve cooling and extend differential component life
• Precision fitment ensures easy installation without modifications
• Compatible with Duramax and Cummins diesel engines as well as gasoline variants
• Enhances the rugged look of your truck’s undercarriage with a sleek gun metal finish

Construction & Design:

The Wehrli rear differential cover is expertly fabricated from aircraft-grade aluminum, providing a perfect balance of strength and lightweight performance. This material choice offers superior resistance to dents and deformation compared to stock steel covers, which is critical for off-road and heavy-duty use. The cover’s design increases the internal fluid volume, which helps reduce operating temperatures and improve lubrication efficiency for the differential gears and bearings.

Each cover is finished with a durable gun metal powder coating that resists corrosion, chipping, and fading, ensuring long-lasting protection in harsh environments. Stainless steel fasteners and a magnetic drain plug are included to prevent rust and facilitate routine fluid changes, enhancing the overall longevity of your drivetrain components.

Installation & Fitment:

Installation of the Wehrli Gun Metal Rear Differential Cover is straightforward and requires no special modifications. It is engineered to bolt directly onto the factory mounting points of the AAM 11.5 rear axle found on Dodge Ram 2500 and 3500 models from 2003 through 2018. The included stainless steel hardware ensures a secure, leak-free fit. Routine maintenance is simplified thanks to the magnetic drain plug, which allows for easy fluid changes without removing the entire cover.

What's Included:

• Fabricated aluminum rear differential cover with gun metal powder coating
• Stainless steel mounting hardware
• Magnetic drain plug for capturing metal particles
• Installation instructions

Ideal For:

This differential cover is perfect for Dodge Ram 2500 and 3500 owners who require enhanced protection and durability for their trucks’ rear differentials. It is especially suited for enthusiasts who tow heavy loads, drive off-road, or operate in harsh environments where stock covers may be prone to damage. Additionally, it benefits anyone looking to improve the cooling and longevity of their differential components while adding a custom, rugged aesthetic to their vehicle.

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.