Lucky Seven 40k Transmission Oil Cooler LPD47391 — 40,000 lb GVW (Silver), Low-Pressure Drop, Includes Mounting Hardware

The Lucky Seven LPD47391 40k Transmission Oil Cooler is a heavy-duty, low-pressure-drop cooling kit engineered to protect transmissions in vehicles up to 40,000 lbs GVW.

Designed for commercial trucks, trailers, and high-capacity tow rigs, this transmission cooler kit combines high-capacity heat dissipation with a low restriction flow path to keep transmission fluid temperatures in check without adding system strain. The kit ships complete with brackets, bolts, and mounting hardware for a straightforward install, and Lucky Seven backs the unit with lifetime support to help keep heavy vehicles working reliably under load.

How does the LPD47391 reduce transmission temperatures without increasing pressure?

The LPD47391 uses an engineered low-pressure-drop core that increases heat transfer surface area while preserving flow. That design minimizes resistance so the transmission pump doesn’t have to work harder, avoiding added wear and preserving operating efficiency.

• Low-pressure-drop core reduces fluid restriction and pump load
• High-efficiency fin and tube layout for faster heat rejection
• Optimized internal passages to promote steady, even flow

What vehicles and applications is this cooler suited for?

This cooler is rated for vehicles with a maximum gross vehicle weight of 40,000 lbs, making it appropriate for medium- to heavy-duty trucks, commercial trailers, RV tow packages, and other high-capacity towing rigs. It’s compatible with common aftermarket and OEM fittings for transmission cooling systems.

• Rated up to 40,000 lb GVW for heavy-duty trucks and trailers
• Ideal for frequent towing, hauling, and commercial duty cycles
• Works with typical transmission fluid lines and fittings used in heavy vehicles

What comes in the kit and how difficult is installation?

The LPD47391 kit includes the cooler core plus all required mounting hardware: brackets, bolts, and fasteners selected to suit a range of vehicle layouts. Installation is intended for technicians or experienced DIYers and generally requires basic hand tools, a secure mounting point ahead of airflow, and routing of transmission lines to the cooler.

• Complete mounting hardware included for secure attachment
• Standard hose and line connections for straightforward plumbing
• Clearances and mounting instructions reduce installation guesswork

What support and durability can I expect from Lucky Seven's LPD47391?

Lucky Seven offers lifetime support with the LPD47391, providing access to technical assistance and warranty coverage for peace of mind. The cooler is built from corrosion-resistant materials and designed for the thermal demands of heavy-duty service.

• Lifetime support and warranty from Lucky Seven
• Durable construction for commercial operating environments
• Designed to help extend transmission component life under load

Who is this for: The LPD47391 is aimed at fleet operators, truck owners, professional haulers, and anyone who routinely tows heavy loads or operates vehicles near the 40,000 lb GVW range. If you need a robust transmission cooling solution with minimal pressure impact and full mounting hardware included, this kit is built to meet heavy-use demands and simplify installation while offering manufacturer support.