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Tru Cool 47391 40k GVW Transmission Coolers in Stock and Ready to Ship

The 40,000 GVW Tru-Cool 47391 is now in stock and ready to ship from Oregon Performance Transmission.

The Low Pressure Drop, or LPD47391, is by far our most popular cooler for RV towing or heavy duty use.

Due to the Coronavirus shutdowns, there have been many backorders and shortages of this transmission cooler this year. Oregon Performance Transmission has these coolers in stock and ready to ship to you immediately.

This universal fit 40k GVW oil cooler offers the ultimate protection against overheating transmissions, and will install in most full size trucks and SUV applications with excellent results. The 47391 is perfect for heavy towing or hot summer driving, and is a must for heavy duty applications, including racing. Keeping your cooler temperatures low is the first step in avoiding premature, costly repairs, and transmission rebuilds.

Known by multiple names and part numbers, this is the ultimate automatic transmission cooler.

Click here to purchase.

For smaller trucks and passenger cars, Tru-Cool has a full line of fluid coolers to meet your application needs. Click below for the full product line.

Tru Cool full product line

If you have any questions or need assistance with your order, please do not hesitate to contact us at sales@oregonperformancetransmission.com.

Posted on August 20th, 2020
Posted by Brian
No Comment »
Filed under: 47391, Tru-Cool
Tags: 40k, 47-391, 47391, camping, cooler, covid shutdown, DIY, fluid cooler, gvw, heavy duty, high temperatures, low pressure drop, LPD, LPD cooler, motor home, recreational, road trip, RV towing, summer cooling, towing, transmission cooler, transmission life, Tru-Cool

Sep

Do I need a thermal bypass?

Fall is a great time to consider installing a transmission cooler in your vehicle. For many people, the busyness of summer travel has settled down, the kids are back in school, and there’s finally time to work on vehicle projects before the snow and freezing temperatures hit.

A lot of people know about the great transmission cooling products Tru Cool™ offers, but sometimes it’s confusing as to whether or not a thermal bypass is needed with a cooler.

Our most popular transmission cooler from Tru-Cool™, part number LNG-47391, has a sister cooler under part number LNG-4739. The only difference between the two? The 4739 comes with a thermal bypass, while the 47391 does not.

So what is a thermal bypass?

The thermal bypass is a small added valve that goes in the transmission line. When the transmission is cold, the thermal bypass will “bypass” the cooler so it can bring the transmission up to operating temperature more quickly.

Do I need a thermal bypass?

A bypass is not something that is typically needed unless you live in a fairly cold climate; for example, a place where temperatures in the winter are regularly below 32°F.

I already own a cooler but it doesn’t have a bypass. Can I buy the bypass separately and add it on?

Yes. The bypass works very well with other coolers, such as the Tru Cool™ 49211 cooler. So if you already have a cooler you like, adding the bypass on is definitely okay.

Where can I buy a thermal bypass?

We sell the bypass individually under part number LNG-4739P6.

If you would like to purchase a cooler with a bypass, we sell that package under part number LNG-4739.

If you do not need the thermal bypass but do need a great transmission cooler, and have the available space, we have that product under part number LNG-47391.

For more information about transmission or engine oil coolers, please feel free to contact us at sales@oregonperformancetransmission.com.

Posted on September 20th, 2017
Posted by Brian
No Comment »
Filed under: 4739, 47391, FAQ's, thermal bypass, Tru-Cool
Tags: bypass, cold weather, cooler, cooling, DIY project, FAQ, freezing, performance, transmission, Tru-Cool

Dec

Transmission Failure and Snowplowing

7437758
Snowplow season is upon us for many across the country.

Plowing and towing at low speeds with an automatic transmission can produce a huge amount of heat, and when it comes to transmission life and longevity, heat is the number one enemy.

If you find yourself needing to rebuild or upgrade your transmission this winter, and you will be plowing or towing, we really recommend our high performance rebuild kits. Our HP kits come with Red lined clutches and Black Kolene steel plates. These clutches are specifically designed to handle 300% more heat than the factory type clutches, and considerably more than the HD high energy clutches. We have HP rebuild kits from Oregon Performance Transmission for the Ford, Chevy, and Dodge transmissions, as well as top quality shift kits to compliment your rebuild.

Our high performance rebuild kits can be found by clicking on the popular transmission application links below.

Chevrolet HP Rebuild Kits
• TH350
• TH400
• 700R4
• 4L60E
• 4L80E

Dodge HP Rebuild Kits
• A904
• A727
• A518, 46rh, 46re
• A618, 47re, 47rh
• 48re

Ford HP Rebuild Kits
• C4
• C6
• AOD
• AODE, 4R70W, 4R75W, 4R70E, 4R75E
• E4OD, 4R100

Even though it’s winter and cold outside, if you are snowplowing or towing, we strongly recommend installing a transmission cooler as well. Our best-selling transmission cooler is the 47391 40,000 GVW Low Pressure Drop cooler from Tru-Cool. This cooler is a work horse and will definitely help keep your transmission temperatures low. You can find it on our website, https://www.oregonperformancetransmission.com under part number LNG-47391.

As always, if you have any questions please do not hesitate to email us at sales@oregonperformancetransmission.com

Posted on December 15th, 2016
Posted by Brian
No Comment »
Filed under: 47391, 4L60E, 4L65E, 4L70E, 4L75E, 4R70W, 4R75E, 4R75W, 700R4, A727, A904, AODE, Chevrolet, Dodge, Ford, GM, Tru-Cool
Tags: 4L60E, 4L65E, 4L70E, 4L75E, automatic transmission, Chevrolet, Chevy, clutches, cooler, Ford, GM, GMC, heat, horsepower, LPD cooler, Oregon Performance Transmission, rebuild, shift kit, snow, snowplow, steel plates, tow, towing, transmission life, Tru-Cool

Feb

The RE5R05A transmission and common cooling problems

It may still be snowing in many parts of the US, but warmer weather is right around the corner. We know that the sunshine brings many of us out of our shop hibernations with the anticipation of more time on and off the road and track.

One transmission that we repeatedly see many questions about is the RE5R05A from Nissan. This is the tranny you will find in vehicles like the Frontier, Xterra and Pathfinder. It is also found within the Titan, Armada and Navara, to name a few. While an extremely popular transmission, it also comes with a popular problem: the radiator often leaks water into the transmission fluid which eventually burns up the transmission. Most people discover this problem after the transmission has blown. Others, while they may still have an operational transmission, are surprised and dismayed to discover the leak. If there is water in the fluid, it’s too late to save the tranny.

The solution to a burned transmission of course is to rebuild it. Oregon Performance Transmission stocks a complete, solid kit for the RE5R05A (part number OPT-RE5R05A-RB) as well as many other products and upgrades.

One preventative solution to this leakage problem is to bypass the radiator with an external cooler, thereby eliminating the need for the radiator all together. You can effectively get rid of the problem before it even has a chance to occur. Depending on your vehicle’s space, we suggest installing the largest external cooler possible. The brand we trust the most is Tru-Cool by Dana Corporation. They are manufactured in Canada and are solid, strong and extremely well-built.

LNG-47391

Remember, the Tru-Cool coolers are not vehicle-specific, they are space-specific. If you can fit a 40,000 GVW cooler in your truck, we highly recommend doing so.

For additional information about any of the products mentioned here, or to answer any other questions, please feel free to contact us at salesdesk@optsales.com. It’s not too late to save that transmission!

Posted on February 12th, 2014
Posted by Brian
No Comment »
Filed under: Nissan
Tags: 47391, Armada, cooler, Infinity, kit, Navara, Nissan, Pathfinder, QX56, RE5RO5A, rebuild, Titan, transmission, Tru-Cool, Xterra

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Tru Cool 47391 40k GVW Transmission Coolers in Stock and Ready to Ship

Do I need a thermal bypass?

Transmission Failure and Snowplowing

The RE5R05A transmission and common cooling problems

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