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

The Lucky Seven LPD47391 40k Transmission Oil Cooler Kit is a heavy-duty, low-pressure-drop cooler engineered to protect transmissions on vehicles up to 40,000 lb GVW and includes a full mounting kit for fast installation.

Designed for commercial trucks, trailers, towing rigs and large SUVs, the LPD47391 helps control transmission temperatures during heavy loads, long hauls and demanding conditions. Its low-pressure-drop architecture promotes efficient oil flow with reduced system resistance, while the supplied brackets, bolts and fasteners make it straightforward to fit the cooler to a wide variety of chassis and frame layouts. Backed by a lifetime warranty, the unit aims to extend transmission life and support dependable performance under sustained stress.

How does this cooler reduce transmission heat while preserving oil flow?

The LPD47391 uses an advanced core and fin layout that maximizes heat transfer area while minimizing flow restriction. That low-pressure-drop design keeps oil circulating efficiently so the transmission maintains optimal lubrication and hydraulic function during towing or heavy use.

• High-efficiency cooling core with increased surface area for heat dissipation
• Fluid passages engineered to lower pressure loss and maintain oil flow
• Corrosion-resistant finish for consistent thermal performance over time

Will this cooler fit my heavy truck, trailer or towing rig?

The LPD47391 is specified for vehicles with a maximum gross vehicle weight (GVW) of 40,000 lb, making it suitable for many commercial trucks, trailers, large SUVs and vocational vehicles. The kit includes universal-style mounting hardware intended to accommodate common frame and bumper mounting points.

• Rated for up to 40,000 lb GVW—built for heavy-duty applications
• Comes with brackets, bolts and fasteners to simplify installation
• Designed to be compatible with Tru-Cool style setups and common transmission lines

How difficult is installation and what hardware is included?

Installation is aimed at mechanics and experienced DIYers. Lucky Seven supplies a complete mounting kit so you won’t need to source separate brackets or fasteners; basic tools and a vehicle lift or jack stands are recommended for safe installation.

• Full mounting kit: brackets, bolts and fasteners included
• Straightforward bolt-on fit for many mounting locations
• Clearance and hose routing considerations provided to avoid line interference

What long-term benefits can I expect from adding this cooler?

By holding transmission oil temperatures in check during heavy loads and sustained towing, the LPD47391 helps reduce wear on seals, clutches and gearsets. Consistent, lower operating temperatures can mean fewer heat-related failures and more reliable shifting under stress.

• Helps protect transmission components from heat-related degradation
• Supports consistent shift performance under load
• Potential for improved efficiency and reduced risk of overheating during long hauls

Who is this for: The Lucky Seven LPD47391 40k Transmission Oil Cooler Kit is aimed at fleet operators, commercial drivers, towing enthusiasts and owners of heavy SUVs or trucks who frequently carry heavy loads, tow trailers or drive in hot or demanding conditions. If you need a rugged, low-restriction cooler rated for up to 40,000 lb GVW with a full mounting kit and lifetime warranty, this product is engineered for that purpose.