aFe Pro Series Rear Differential Cover

2003–2007 Dodge Ram 2500 / 3500

Part #: 46-70392

Overview

The aFe Pro Series Rear Differential Cover is a high-quality upgrade designed specifically for 2003 to 2007 Dodge Ram 2500 and 3500 trucks equipped with AAM 11.5-inch 14-bolt rear axles. This premium cover replaces the factory stamped steel differential cover with a durable, finned aluminum design that significantly improves heat dissipation and fluid capacity. Ideal for truck owners who tow, haul heavy loads, or drive in demanding conditions, the aFe Pro Series cover helps maintain optimal operating temperatures to extend the life of your rear differential and enhance overall drivetrain reliability.

With its rugged construction and functional features, this differential cover is perfect for enthusiasts and professionals seeking both enhanced protection and a custom, performance-oriented appearance for their Dodge Ram.

Key Features

Engineered for durability and improved thermal management, the aFe Pro Series Rear Differential Cover offers the following benefits:

• Constructed from die-cast A380 aluminum for superior strength and lightweight durability
• Machined cooling fins cast directly into the cover to increase surface area and improve heat dissipation
• Wrinkle black powder-coated finish provides corrosion resistance and a rugged, aggressive look
• Increased fluid capacity by 3 to 4 quarts to enhance lubrication and cooling efficiency
• Magnetic drain plug captures metal particles to protect gears and simplify fluid changes
• 1/8" NPT temperature sensor port allows easy monitoring of differential fluid temperature
• Reinforced ribs integrated into the casting add structural integrity and resist warping
• Large oil level sight glass with calibration plug set to factory specifications prevents overfilling
• Dual neodymium magnetic plugs maximize gear protection from metal debris
• Designed to fit AAM 11.5-inch 14-bolt rear axles found in Dodge Ram 2500 and 3500 models

Construction & Design

The aFe Pro Series Rear Differential Cover is precision-engineered from die-cast A380 aluminum, a material known for its excellent strength-to-weight ratio and thermal conductivity. The integrated machined cooling fins maximize heat transfer, helping to keep differential fluid temperatures lower during heavy-duty operation. Reinforced ribs within the casting provide added rigidity to withstand impacts and prevent deformation under stress.

The wrinkle black powder-coated finish not only protects the cover from corrosion and environmental damage but also complements the aggressive styling of Dodge Ram trucks with a professional, rugged appearance. Functional elements such as the magnetic drain plug and temperature sensor port are seamlessly incorporated without compromising structural integrity.

Installation & Fitment

Installation is straightforward and designed as a direct replacement for the factory stamped steel rear differential cover on 2003–2007 Dodge Ram 2500 and 3500 trucks equipped with AAM 11.5-inch 14-bolt rear axles. No vehicle or differential modifications are required. The increased fluid capacity does not affect existing dipstick or fill procedures. All necessary mounting hardware is included, allowing for a quick upgrade that enhances cooling and protection in just a few hours.

What's Included

• One aFe Pro Series Rear Differential Cover with machined cooling fins
• Magnetic drain plug
• Temperature sensor port plug (1/8" NPT)
• Calibration plug for oil level sight glass
• Mounting hardware kit

Ideal For

This differential cover is ideal for Dodge Ram 2500 and 3500 owners who frequently tow trailers, haul heavy payloads, or operate their trucks in off-road or high-stress environments. It is also well-suited for enthusiasts seeking to improve the durability and longevity of their rear differential while adding a custom, performance-focused aesthetic. Whether for daily driving, work, or recreational use, the aFe Pro Series Rear Differential Cover delivers reliable protection and enhanced thermal management to keep your drivetrain performing at its best.

aFe POWER (Advanced FLOW Engineering) offers dyno-proven intake, filtration, and exhaust upgrades aimed at measurable performance gains. The brand’s lineup is geared toward enthusiasts looking for better airflow, improved sound, and durable materials—from cold air intakes to stainless exhaust systems for street and track applications.