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Tru-Cool - Max LPD47391 47391 Low Pressure Drop Transmission Oil Cooler

4.8 out of 5 stars 867 ratings

Price: $149.00

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  • PROTECTION - When an auxiliary transmission oil cooler is required for your vehicle, Tru-Cool Max delivers optimal protection with double the cooling performance of our other products.
  • RELIABLE - Durable brazed aluminum construction with a lifetime guarantee
  • HIGH COOLING POWER - Maintain lower temperatures in your transmission and lubricant with Tru-Cool and extend the life of the vehicle you depend on.
  • PERFORMANCE RATED - Drive hard. Rest easy. Get the OE advantage that comes from a Tru-Cool LPD transmission oil cooler plus the proven cooling that can help you protect your investment and your warranties.
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Frequently bought together

  • Tru-Cool - Max LPD47391 47391 Low Pressure Drop Transmission Oil Cooler
  • +
  • GM Genuine Parts 19130039 Automatic Transmission Fluid Cooler Line Connector
  • +
  • Anderson Metals 50062-06 50062 Brass Compression Tube Fitting, Union, 3/8" x 3/8" Tube OD
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Customer Rating 4.8 out of 5 stars (867) 4.8 out of 5 stars (67) 4.8 out of 5 stars (194) 4.9 out of 5 stars (44) 4.7 out of 5 stars (479) 4.5 out of 5 stars (166)
Price $149.00 $418.95 $155.53 $128.10 $16.64 $55.77
Sold By MaxxIndustries Amazon.com Amazon.com Amazon.com Amazon.com Amazon.com
Item Weight 1.76 ounces 1.00 lbs 8.00 lbs 2.65 lbs 0.80 ounces 2.50 lbs

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Installer note, the use of a backup wrench on the fixed fittings is absolutely essential for the proper installation of this cooler. Leaks caused by the cooler fittings being “twisted” can not and will not be a warrantable item.

Product description

Long Tru-Cool Max transmission cooler P/N LPD47391. This cooler is rated at 40,000 GVW and measures 8.5"x22.75"x1.25". This is a stacked plate, low pressure drop unit. This cooler has 3/8" inverted flare fittings. This is the ultimate cooler for heavy towing and is a must for heavy duty applications, including racing. Heat is what kills an automatic transmission. If you want to extend the life of your transmission and avoid or prolong a costly rebuild, this is very cheap insurance. All parts and instructions are included to mount and plumb this cooler. Advanced cooling protection for car, van, light truck, R.V. and towing applications. When Automatic Transmission Fluid is cold it is viscous. The unique Tru-Cool design allows the colder, thicker ATF to flow more efficiently through two open bypass channels positioned at the top of the cooler. As operating temperatures increase, the ATF becomes hotter and thinner. It's then directed through the core where it is cooled. Tru-Cool's highly efficient cooling technology combines improved protection against lube system failure with optimal heat transfer.


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Customer reviews

4.8 out of 5 stars
4.8 out of 5
867 global ratings
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Top reviews from the United States

Reviewed in the United States on August 23, 2017
Verified Purchase
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5.0 out of 5 stars Best cooler for the 4L60e while retaining quick connects
By BeardwnAZ on August 23, 2017
Recently installed a fully built 4L60e from Tru-Tech Transmissions in alabama(one of the premiere builders of the 4L60 trans). I wanted something that was much larger vs the factory cooler, but also wanted to retain the factory quick connect fittings and not have to run more rubber hose. Found a company that makes the brackets to fit 99 and up Silverados(PayPal tim@eadperfromance.com $65 for brackets, includes shipping). Then all you have to do is order the GM quick connect fittings (2) part number 19130039, and (1) Anderson metals 50062 compression tube fitting (3/8). Then watch this YouTube video for installation "aftermarket GM transmission cooler install 99-06.
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83 people found this helpful
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Reviewed in the United States on January 3, 2020
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5.0 out of 5 stars Easy install
By Speedy on January 3, 2020
I installed this transmission cooler on my 2016 Chevrolet Silverado 1500 with the 6l80e transmission. Installation was fairly simply. Universal brackets can be bent to work with what you have. Came with hose and a handful of fittings and 4 clamps. Overall a nice kit. Cooler needs to be installed with the inlet/outlet upright. If installed upside down the fluid will stay at the bottom and you may not utilize the entire cooler.

Why I installed it.
I recently had my torque converter fail and it sent metal all through out the transmission and the factory cooler. You are supposed to hot flush the coolers in both directions for so long and even then you're not guaranteed to get all the metal out. The shop said they did this but temperatures would climb to 190 to 200 within 20 minutes of driving to town. The factory cooler ended up being clogged and was restricting flow so basically the fluid was not getting cooled off. I was headed for another failure if i didnt do something about it. I decided to do this cooler along with new lines with 6an fittings. I also installed a -6an cooler line adapter plate which allowed me to bypass the 190° thermostat.(not recommended in colder climates, I live in south MS). I drove the truck the same amount of time to town and back. And the temps never got above 120°. I'm making a 800 mile non stop trip in a week so we will see how it really performs. Its definitely a recommended add modification along with the factory cooler if you are running a stall converter or towing.
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15 people found this helpful
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Reviewed in the United States on February 22, 2020
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1.0 out of 5 stars Description isn't the same as what they are selling
By Jason on February 22, 2020
Description doesn't match unit being sold. The LPD4739 is what they describe but they sell you the LPD47391. The 4739 has the bypass built in and the 47391 doesn't. The description describes the 4739 but they are selling the 47391. You won't know this until you see the box and the label tells you the difference between the two.
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17 people found this helpful
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Reviewed in the United States on February 14, 2019
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5.0 out of 5 stars 40-50 degree drop in temps
By The big tuna lv on February 14, 2019
The perfect cooler for a gmt900 truck!
Mine is a 2011 Sierra

Tagged the front of it black so it wouldn’t stand out along with the brackets. Drilled two holes in the latch bracket brace to hold the top brackets of the brace. That was the only “Permanent” mod to the truck.

Next I used two bolts and cut some tubing to make sleeves to the bottom would stick out a 1/4 inch forward so it wouldn’t be sitting on the cross bar preventing the chance of rubbing.

For the inlets the ac delco 19130039 push connect fitting instead of the doorman’s.
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20 people found this helpful
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Reviewed in the United States on May 31, 2017
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20 people found this helpful
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Reviewed in the United States on May 29, 2019
Verified Purchase
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5.0 out of 5 stars The only trans cooler to get
By Amazon Customer on May 29, 2019
2010 Silverado. Before I did this I was flirting with 200+ trans temps, after I barely bust 160 in the Texas heat. Installation was a breeze once I got the gm quick connect to invert 5/8th adapters from Napa, was able to move the right line and swivel the left once I cut and installed a 3/8 compression coupling. Supplied brackets seem sturdy. At $135 it’s pretty cheap insurance for a trans on a tuned truck!
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11 people found this helpful
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Reviewed in the United States on September 29, 2017
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12 people found this helpful
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