KOROP Transmission Oil Cooler Kit 40K GVW Low-Pressure-Drop Brazed-Aluminum with Mounting Hardware

The KOROP LPD47391 40K Low-Pressure Drop Transmission Oil Cooler Kit is a brazed-aluminum cooler and hardware set engineered to lower transmission oil temperatures for heavy-duty vehicles up to 40,000 lb GVW.

This transmission oil cooler kit is built to meet the demands of towing, commercial hauling, RV use and heavy-duty duty cycles. Its brazed-aluminum core and low-pressure drop design increase cooling capacity while minimizing restriction to fluid flow. The kit ships with a full complement of brackets, bolts and fasteners so you can mount it across a wide range of cars, vans, light trucks and RV installations without hunting down extra parts.

How does this cooler reduce transmission temperatures without hurting fluid flow?

The LPD47391 uses a brazed-aluminum construction and an internal low-pressure-drop layout that improves heat transfer area while keeping resistance to fluid movement low. That balance lets the unit shed more heat per pass without forcing the transmission pump to work harder. The result is lower operating oil temperatures with minimal impact on system pressure.

• Brazed-aluminum core for better thermal conductivity and durability
• Low-pressure-drop channels preserve normal fluid flow and pump efficiency
• Reportedly up to ~30% increased cooling capacity versus conventional designs
• Engineered for continuous heavy-duty operation under tow and load

Will this fit my vehicle and replace the listed part numbers?

The kit is specified as a 40K transmission cooler compatible with a wide range of cars, vans, light trucks and RVs used in towing or heavy-duty service. It is offered as an alternative to common factory and aftermarket references such as LPD47391, 47391, and OC-4739-1; verify OEM fitment against your vehicle’s cooler dimensions and fittings before installation.

• Compatible with many applications up to 40,000 lb GVW when matched to vehicle fittings
• Cross-references include LPD47391, 47391 and OC-4739-1 for easier lookup
• Measure existing cooler inlet/outlet spacing and hose diameter prior to purchase
• Consult vehicle service manual or a technician for final fit confirmation

What hardware and parts are included with the cooler kit?

This package contains a complete mounting kit so you can secure the cooler without sourcing separate brackets and fasteners. The included hardware is chosen to fit a variety of installation geometries and to withstand vibration and temperature cycles common in heavy-duty applications.

• All mounting brackets required for common radiator or frame-mount installations
• Assorted bolts, washers and lock fasteners for a stable, rattle-resistant mount
• Fittings and hose clamps where applicable for secure fluid connections
• Installation hardware designed to accommodate multiple vehicle layouts

What kind of warranty and support does KOROP provide?

KOROP backs this transmission cooler kit with a 12-month limited warranty. Customer support is available for fitment questions and post-sale assistance, making it easier to resolve installation issues or confirm compatibility before you begin work.

• 12-month warranty coverage for manufacturing defects
• Pre- and post-sale customer support for product questions
• Contact options available for troubleshooting and replacement guidance

Who is this for? The KOROP LPD47391 40K transmission oil cooler kit is aimed at vehicle owners and fleet operators who tow frequently, drive heavy loads, or want to reduce transmission oil temperatures in commercial and recreational vehicles. It suits mechanics, DIY installers and technicians who need a robust, low-restriction cooler with complete mounting hardware and cross-reference compatibility to common part numbers. If you require improved heat rejection without adding significant pressure drop, and you need a ready-to-install kit for heavy-duty use up to 40,000 lb GVW, this product is designed for your application.