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40k Transmission Oil Cooler LPD47391, Heavy Duty 40,000 GVW Max, Low Pressure Drop, Compatible with Tru-Cool,Includes Mounting Hardware-Ideal for Heavy Vehicles,40,000 GVW transmission cooler (Silver)

Based on 240 reviews
Condition: New
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$68.98
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At a glance

Condition
New
Color
silver
Model
LPD47391 40k
Dimensions
4 x 3 x 3 in
Weight
4 oz
Exterior
Brushed

Features 5

  • [Application and Compatibility] The LPD47391 40k Transmission Oil Cooler Kit is engineered for heavy-duty vehicles, with a maximum GVW of 40,000 lbs. Transmission cooler,Perfect for large trucks, trailers, and towing vehicles, it ensures your vehicle runs cooler and more efficiently.
  • [Low Pressure Drop Design] LPD47391 40k Transmission Oil Cooler Kit,With advanced low-pressure drop technology, the cooler minimizes energy consumption and system pressure loss, maximizing transmission efficiency while protecting critical components from excessive heat.
  • [Includes Mounting Hardware] The LPD47391 40k Transmission Oil Cooler Kit includes all essential mounting hardware bolts, fasteners, and brackets designed for various vehicle types. With simple installation, youll have a secure, stable fit for long-term reliability.
  • [Advanced Cooling Protection] LPD47391 40k Transmission Oil Cooler Kit,Designed for advanced cooling protection, this kit maintains optimal transmission temperature, prolonging its lifespan, enhancing fuel efficiency, and reducing the risk of costly repairs.

Description

Efficient Cooling for Heavy-Duty Vehicles The LPD47391 40k Transmission Oil Cooler Kit is engineered to deliver superior cooling performance for vehicles with a maximum gross vehicle weight (GVW) of 40,000 pounds. Whether you're driving a large commercial truck, towing a trailer, or operating a heavy-duty SUV, this transmission cooler is designed to help maintain optimal performance by keeping transmission temperatures in check. Ideal for towing and long-distance travel, the cooler enhances vehicle efficiency and reliability, especially during high-stress operations. Low Pressure Drop Design for Maximum Efficiency One of the standout features of this transmission cooler is its advanced low-pressure drop technology. By minimizing pressure loss as the oil flows through the cooler, it reduces energy consumption while maintaining optimal transmission function. This helps protect your vehicle’s critical components from overheating, ensuring smoother gear shifts and prolonged transmission life. The low-pressure design also helps save fuel, making this cooler a valuable upgrade for those looking to increase their vehicle’s efficiency. Complete Mounting Kit Included Installation is made easy with the included mounting hardware. The LPD47391 kit comes with high-quality bolts, fasteners, and brackets that are designed to fit a wide range of heavy-duty vehicles. Whether you are a professional mechanic or a DIY enthusiast, the straightforward installation process ensures a stable, secure fit. This means you can quickly install the cooler and get back on the road with confidence. Advanced Cooling Technology for Long-Term Protection With advanced cooling technology, this transmission oil cooler not only maintains a steady operating temperature but also significantly extends the life of your transmission. By efficiently dissipating heat, the cooler helps prevent potential damage caused by overheating, reduces the likelihood of maintenance issues, and ensures your vehicle performs at its best. Whether you’re towing heavy loads, driving through rough terrain, or dealing with hot climates, this cooler keeps your vehicle running smoothly.Whether you’re looking for enhanced transmission cooling for everyday driving or need a reliable solution for long hauls and towing, the LPD47391 40k Transmission Oil Cooler Kit provides unmatched performance, longevity, and peace of mind. Upgrade your vehicle’s cooling system today and ensure your transmission stays protected in even the most demanding conditions.

Specs 8

Manufacturer 40k Transmission Oil Cooler
Brand Lucky Seven
Model 40k Transmission Oil Cooler
Item Weight 4 ounces
Product Dimensions 4 x 3 x 3 inches
Item model number LPD47391 40k
Exterior Brushed
Manufacturer Part Number LPD47391 40k

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Sunday, Nov 1

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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Top Amazon Reviews


Excellent Cooling Performance – Huge Temperature Drop While Towing
Color: silver
I installed the LPD47391 40K Transmission Oil Cooler on my Hummer H3, and the results have been outstanding. Before the installation, my transmission oil temperature would climb to around 116°C (241°F) when towing for about an hour. After installing this cooler, I completed a 5-hour towing trip, and the transmission temperature never reached 80°C (176°F). That's a massive improvement and exactly what I was hoping for. Installation was straightforward using only the included hardware and brackets. On the H3, I did have to make a few adjustments: Relocated the horn to create enough mounting space. Moved the wiring attached to the center support in front of the radiator. Mounted the cooler with the ports facing upward to help prevent air from becoming trapped inside the unit. One thing I chose not to use was the supplied hose. I couldn't find sufficient information regarding its pressure or temperature ratings, so for peace of mind I purchased 10 feet of hydraulic transmission-rated hose, cut it into two sections, and used that instead. Overall, I'm extremely happy with this cooler. The reduction in transmission temperature has been dramatic, and it has given me much more confidence when towing for extended periods. If you're looking for a heavy-duty transmission cooler and have the space to install it, I'd definitely recommend this one. Pros: Excellent cooling capacity Significant reduction in transmission temperatures Includes mounting hardware and brackets Solid construction Great for towing applications Cons: Included hose specifications are not clearly documented May require minor vehicle-specific modifications for mounting however i did not drill or cut anything, only used holes that were already there and parts that came with the radiator. Bottom line: A worthwhile upgrade that reduced my towing transmission temperatures from 116°C to under 80°C. Very satisfied with the purchase. ... show more
Reviewed in the United States on July 28, 2026 by Eduardo A. Rodriguez

It cools great
Color: silver
Well packaged. Installed into diesel with allison 1000, It dropped transmission temperature 20° - 25°. Update: replacement ordered, weld broke and failed. 2nd replacement failed. Will not order again.
Reviewed in the United States on June 26, 2025 by Craig

Works great
Color: silver
Been 6 months since ii instaled 1 on my 2012 suburban 5.3 6l80 and I just went 2 Montana from wa an back 90 mph and it was 94 degrees out side transmission not get above 154 degrees bad ass product
Reviewed in the United States on August 30, 2026 by Jordan Bluford

Failed like others mention
Color: Black
I gave it a shot even though the reviews stated the facts.it was installed on my Chevy base RV with supplied hoses. First the hose leaked on me not once but twice. Upon replacing you could see the poor quality of the supplied hose compared to a gates transmission cooler line. Cost me 1 gallon of fluid each leak, good thing I didn’t take my transmission out. On the third leak is the actually cooler leaking. I have used these 40 k coolers from summit that are branded so in conclusion it will cost you more going this cheap route, don’t do it. I know some of you have success and others don’t. I used these Amazon coolers on this Rv and on a jeep. Going to swap them back to tru-cool 40k which I have on my gmc for the last 10 years without issues. I also feel like the fins are very cheap, over all cheap compared to the actual tru-cool. ... show more
Reviewed in the United States on April 29, 2026 by Breakitfixit

Well worth the money!!
Color: Black
It was really hot. We were stuck in a tunnel in Boston. Boston is hell at rush hour. We knew this...we went anyway. We were hauling a big trailer with a 1985 Chevy pick up. It's old. We're old too. We knew it was a lot to ask of this truck, so installed this transmission cooler. The truck didn't over heat! We didn't have to run the heater on a 90 degree day in the tunnel! It still was a horrible trip, but at least made less horrible by a GREAT transmission cooler! On the way home to Maine we avoided Boston, we swung by the White Mountains, and again, the cooler worked great, hauling up those big hills in the White Mountains it performed flawlessly! We would highly recommend!! ... show more
Reviewed in the United States on October 23, 2025 by Lisa S.

Overall good just cheap hose
Color: silver
Almost really good. It comes with enough hardware and fitting that you’ll need. Just don’t use the hose provided. It busted on me only after 2 hours of driving and had me on the side of the interstate. Replaced with some better stuff. Only reason I’m giving it 4 stars.
Reviewed in the United States on June 9, 2026 by Tres C.

expensive for what you get
Color: Black
same item as temu or vevor for 1:2 the price.
Reviewed in the United States on April 30, 2026 by brian

Just installed
Color: Black
So far so good. Ran the truck to add transmission fluid. No leaks. I read other comments that said the hose that came with it is garbage. 6 months ago when I swapped the transmission I made my transmission lines out of hydraulic hose I have access to at work so that wasn’t a concern to me. I installed the cooler off center to avoid the bolt for the power steering cooler. I will update if it fails me. ... show more
Reviewed in the United States on July 7, 2026 by Tattoo Dad
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