LPD47391 40k Transmission Oil Cooler Kit - Low Pressure Drop

In this review of the LPD47391 40k Transmission Oil Cooler Kit, the bottom line is straightforward: this is a practical, no-frills transmission cooler for vehicles and trailers up to 40,000 lb gross weight that focuses on cooling efficiency and fit. The reviewer found it especially useful for owners who tow frequently or operate heavy-duty vans and light trucks and want to reduce transmission operating temperature without sacrificing line flow. The kit clarity, included fittings, and hardware mean the package is ready for installation and delivers clear cooling improvements in demanding service.

Key Features

• Durable construction: The brazed aluminum core is built to resist leaks and handle the higher heat loads of towing or heavy hauling.
• Low flow restriction: With up to 15X less flow restriction, the cooler maintains transmission fluid circulation even under load, reducing the risk of overheating from flow starvation.
• Improved cooling: The core provides about 30% more cooling capacity so transmission temperatures stay lower during sustained towing or heavy use.
• Complete kit: The package includes bolts, nuts, washers, steel mounting straps, brass fittings, hose and clamps, and multiple fittings to simplify a range of installations.
• OEM intent: Manufactured and mechanically tested in ISO certified facilities to meet or exceed OEM quality standards and reference OE numbers for compatibility.

Who It's For

This cooler kit is aimed at drivers of heavy-duty vans, light trucks, RVs and towing rigs that need reliable transmission cooling for loads up to 40,000 lb GVW. It suits owners who prefer a bolt-on kit with a variety of fittings and expect improved temperature control during long highway pulls or repeated towing cycles.

It is less suitable for drivers who require vehicle-specific OEM-branded parts or for users who want premium heavy-gauge mounting hardware; some buyers reported mixed feelings about the hardware quality and may prefer to upgrade brackets and fasteners for extreme duty use.

Pros & Cons

Pros

• Effective temperature reduction during towing and heavy use.
• Low pressure drop preserves transmission fluid flow under load.
• Comes with a full set of fittings and mounting hardware for flexible installation.
• Manufactured and tested in ISO certified facilities for quality assurance.

Cons

• Some customers reported mixed build quality for the mounting hardware, so hardware upgrades may be desirable for severe-duty installs.

Specifications

Model	LPD47391 40k Transmission Oil Cooler Kit
Construction	Brazed aluminum cooler core
Cooling improvement	Approx. 30% more cooling capacity
Flow restriction	Up to 15X less flow restriction
Compatibility	Fits applications up to 40,000 lb GVW; cars, vans, light trucks, RVs
Included hardware	Bolts, nuts, washers, steel mounting straps, brass fittings, hose, clamps
Warranty	12 months

Our Verdict

The LPD47391 40k cooler kit is a sensible value choice for anyone who tows regularly or runs heavy loads and needs a durable, low-restriction cooler to lower transmission temperatures. With a full hardware kit and multiple fittings, it is easy to fit to many vehicles, though users planning extreme duty may want to replace some of the supplied fasteners. Overall, it delivers reliable cooling performance and reasonable value for heavy-duty applications.

Frequently Asked Questions

Will this cooler fit my truck?
It is designed for applications up to 40,000 lb GVW and fits cars, vans, light trucks and RVs, but verify hose and fitting sizes against your transmission cooler lines before ordering.

Is the kit ready to install out of the box?
Yes, the kit includes cooler hose, clamps, brass fittings and mounting hardware to support most installations, though some buyers choose to upgrade fasteners for extreme use.

What warranty is provided?
The product comes with a 12-month warranty and the manufacturer provides support for pre- and post-sale questions.