KOROP 40k Transmission Oil Cooler Kit — Low-Pressure-Drop Brazed Aluminum, Includes Mounting Hardware

KOROP LPD47391 is a brazed-aluminum, low-pressure-drop 40,000 GVW transmission oil cooler kit that reduces transmission temperatures and ships complete with mounting hardware for heavy-duty towing and commercial vehicles.

The KOROP LPD47391 40k transmission cooler is engineered for heavy-duty applications where towing, hauling, or continuous load cycles generate extra heat in the transmission fluid. Built from brazed aluminum and designed with low-pressure-drop core geometry, this cooler delivers increased heat transfer while keeping hydraulic and line pressures stable. The kit includes brackets, bolts, and fasteners to simplify installation across a wide range of cars, vans, light trucks and RVs used in demanding service.

How does this cooler lower transmission temperatures?

The LPD47391 uses an optimized fin-and-tube brazed-aluminum core to increase surface area and improve thermal conduction. Its low-pressure-drop design allows higher flow rates without creating excessive line restriction, so fluid circulates efficiently while shedding heat.

• Brazed-aluminum construction for rapid heat transfer
• Low-pressure-drop core maintains steady flow and prevents restriction
• Larger surface area delivers up to ~30% more cooling capacity versus standard cores

Will it fit my vehicle and replace existing parts?

The LPD47391 is intended for vehicles and equipment rated up to 40,000 GVW and is compatible with many cars, vans, light trucks, RVs, and towing setups. It lists common replacement reference numbers so you can verify compatibility with your current cooler before purchase.

• Fitment references: LPD47391, 47391, OC-4739-1
• Designed for heavy-duty, towing, and commercial applications up to 40,000 GVW
• Check vehicle-specific clearances and hose/end fitting types for direct replacement

What comes in the kit and how easy is installation?

The kit includes the cooler core plus a full complement of mounting hardware—brackets, bolts, and fasteners—so you get everything needed for a secure install. Hardware is chosen to accommodate a variety of mounting orientations and chassis layouts, though some installations may require minor adjustments or additional fittings depending on the vehicle.

• Complete mounting hardware set: brackets, bolts, and fasteners included
• Universal-style mounting options for front-mount or chassis-mounted setups
• Installation typically requires basic hand tools and moderate mechanical experience

How is durability and reliability addressed?

The cooler uses a brazed-aluminum build to resist vibration and corrosion while improving heat transfer efficiency. KOROP backs the LPD47391 with a 12-month warranty and offers customer support for questions before and after purchase.

• Brazed joints improve structural strength and longevity
• Aluminum construction resists rust and supports long-term service in harsh conditions
• 12-month warranty and customer support for installation or performance inquiries

Who is this for: The KOROP LPD47391 40k transmission oil cooler kit is aimed at owners and operators of light- to medium-duty commercial vehicles, tow rigs, RVs, and fleet vehicles that regularly carry heavy loads or tow. It's a practical upgrade for mechanics, DIY installers, and fleet managers seeking dependable cooling performance, easier installation with included hardware, and an option that minimizes pressure drop while boosting heat rejection capacity.