Mishimoto Aluminum Expansion Tank

2019–2025 Ram 2500 / 3500 6.7L Diesel

Part #: MMRT-RAM-19N

Overview

The Mishimoto Aluminum Expansion Tank is a direct upgrade for the factory plastic expansion tank found on 2019 to 2025 Ram 2500 and 3500 trucks equipped with the 6.7L Cummins diesel engine. Designed to address the common issues of cracking, discoloration, and internal degradation associated with the stock plastic tank, this aluminum replacement offers enhanced durability and reliability. It is ideal for Ram owners seeking a long-lasting cooling system component that maintains proper coolant levels and supports optimal engine performance under demanding conditions.

By replacing the fragile plastic tank with a robust aluminum unit, Mishimoto ensures your cooling system remains resilient through thousands of heat cycles, preventing coolant loss and potential engine overheating. This expansion tank also improves the visual appeal of your engine bay with its clean, natural finish, making it a smart upgrade for both performance and aesthetics.

Key Features

Engineered to outperform the factory tank, the Mishimoto Aluminum Expansion Tank offers several key benefits:

• Constructed from high-quality aluminum for superior strength and heat resistance
• TIG-welded seams provide exceptional durability and leak resistance
• Internal baffles reduce coolant starvation and minimize air pockets to protect engine cooling efficiency
• OEM-style level sensor included to maintain full compatibility with the truck’s factory low coolant warning system
• Direct bolt-on replacement requiring no special tools or full coolant system drainage
• Natural finish ready for customization via powder coating, anodizing, or hydro-dipping
• Designed specifically for 2019–2025 Ram 2500 and 3500 6.7L Cummins diesel engines
• Backed by the Mishimoto Lifetime Warranty for peace of mind

Construction & Design

The Mishimoto expansion tank is crafted from premium aluminum, chosen for its excellent thermal conductivity and resistance to cracking under extreme temperature fluctuations. The tank’s TIG-welded construction ensures a strong, leak-proof assembly that withstands the rigors of heavy-duty use. Internal baffles are strategically integrated to maintain consistent coolant flow and prevent air pockets, which can compromise engine cooling performance.

Its natural aluminum finish not only enhances durability but also provides a sleek, factory-inspired look that complements the engine bay. This finish serves as a perfect base for further customization, allowing enthusiasts to tailor the tank’s appearance to their personal style.

Installation & Fitment

Installation is straightforward and designed to be user-friendly. The Mishimoto Aluminum Expansion Tank fits directly in place of the factory plastic tank on 2019–2025 Ram 2500 and 3500 trucks with the 6.7L Cummins diesel engine. No specialty tools or modifications are required, and the cooling system does not need to be fully drained, simplifying the upgrade process. All necessary provisions for factory sensors are included, ensuring seamless integration with the truck’s existing coolant monitoring systems.

What's Included

• Mishimoto Aluminum Expansion Tank (Natural Finish)
• OEM-style coolant level sensor
• All necessary mounting hardware and fittings
• Installation instructions

Ideal For

This aluminum expansion tank is perfect for Ram 2500 and 3500 owners who want to improve the reliability and longevity of their cooling system. It is especially suited for those who frequently tow, haul heavy loads, or operate their trucks in demanding environments where the stock plastic tank’s weaknesses are most apparent. Additionally, enthusiasts looking to enhance their engine bay’s appearance while maintaining factory functionality will appreciate this upgrade.

Mishimoto is a performance cooling brand offering aluminum radiators, intercoolers, oil coolers, hoses, and supporting hardware built to manage heat on hard-driven street and track vehicles. For boosted setups and towing/off-road rigs alike, Mishimoto upgrades are designed to increase cooling capacity and reliability where factory systems can become a limitation.