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  1. Transmission Coolers
  2. Derale
  3. Stacked-Plate Cooler
  4. Heavy-Duty Truck
  5. 13W x 6-7/16T x 2D Inch
  6. Standard Mount
Derale 19-Row, High-Performance, Stacked-Plate Cooler with -10 AN O-Ring Inlets - Class V
Derale

Derale 19-Row, High-Performance, Stacked-Plate Cooler with -10 AN O-Ring Inlets - Class V

Part Number: D51978
$220.13
Transmission Coolers
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13" Wide x 6-7/16" tall x 2" deep, superior heat exchanger improves the performance and increases the lifespan of your vehicle's engine or transmission with maximum efficiency. Great Prices for the best transmission coolers from Derale. Derale 19-Row, High-Performance, Stacked-Plate Cooler with -10 AN O-Ring Inlets - Class V part number D51978 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (6)
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Derale Transmission Coolers - D51978

  • Stacked-Plate Cooler
  • Heavy-Duty Truck
  • 13W x 6-7/16T x 2D Inch
  • Standard Mount
  • With - 10 AN O-Ring
  • Derale

13" Wide x 6-7/16" tall x 2" deep, superior heat exchanger improves the performance and increases the lifespan of your vehicle's engine or transmission with maximum efficiency.


Features:

  • Prolongs life of engine or transmission
  • Improves overall performance
  • Prevents heat-related failures
  • Facilitates heat transfer between high-pressure fluids with furnace-brazed aluminum construction
  • Designed with 19 rows of 2"-wide turbulator plates for increased capacity and more efficient cooling
  • Works as either engine oil or transmission cooler
  • Comes with built-in mounting brackets for easy installation
  • Includes aluminum fittings


Specs:

  • Inlet size: -10 AN O-ring, female
  • Overall dimensions: 13" wide x 6-7/16" tall x 2" deep
  • Distance between inlets: 10"
  • Mounting dimensions: 12-1/4" wide x 5-3/4"
  • 1-Year warranty


Stacked-plate heat exchangers have long been considered the most effective type of oil or transmission cooler, primarily because of their increased surface area. Allowing fluid to spread out over this larger surface area decreases the time required for heat transfer to take place. As a result, plate coolers typically manage to cool a greater volume of fluid faster than tube-and-fin, or even plate-and-fin, varieties. Add to that the turbulator technology - whereby fluids are agitated continuously to not only facilitate heat transfer, but also to prevent any undesirable drop in pressure - and you have an absolutely superior cooling system.

Dimensions

51978 Derale Stacked Plate Cooler





Ratings & Reviews

5.0

6 reviews
5 Stars
(6)
4 Stars
(0)
3 Stars
(0)
2 Stars
(0)
1 Star
(0)
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by:
Worked perfectly, under the grill facia it was almost invisible. Kept the AT fluid about 20 degrees F cooler. Easy to install (About 2 hours)
by:
This transmission cooler is a true game changer. We are now able to climb steep grades without overheating the transmission. Installation was fairly straightforward, and it fit in the same location as the original cooler. We have traveled over 4500 miles since installation and are very happy with its performance.
Jj profile picture

Jj

3/2/2022

After one year this transmission cooler is working great. We have traveled over steep mountain grades with no problems.

by:
I just received the Derale D13403 transmission oil cooler and the Firestone Ride-Rite air suspension system for my truck. I have not installed them yet but my experience with the ordering process was excellent. I placed my order on a Saturday afternoon and received confirmation of shipment later the same day. Everything was packaged very well and free delivery was quick. I have ordered from etrailer before and will continue to use them as my needs arise..
by:
Cooler was well built and fit my 2002 Silverado with some slight modifications to the existing bracing. It seems to cool well but I haven’t towed anything heavy yet in warmer temps to know how well it cools above the stock cooler.
Stephen profile picture

Stephen

3/15/2025

Derale transmission cooler is working well. It keeps the transmission around 15-20 degrees cooler in my 2002 2500HD Silverado with normal towing. When transmission temp does go up when pulling steep hills or driving through a town it cools back down pretty quickly afterwards. For normal driving it really keeps the transmission cooler. I have a 4180E transmission which runs around 175-180 degrees towing a 7500 lb 5th wheel camper in warm weather.

Robin H. profile picture
Etrailer Expert

Robin H.

3/15/2025

@Stephen glad to hear it is working so well!
by:
ordering was easy. Paula was professional, knowledgeable and helpful. The product arrived on time and was in excellent condition ready to install. Installation wasn't complicated just a few hours from start to finish. We are ready to roll!
by:
Absolutely awesome!!!! Took 100 degrees out of the Trans! Pulling a trailer through the mountains. 100% recommended. It didn't fit quite perfect on my 2014 yukon and had to buy more hose but worth every penny spent! I will buy again
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See what our Experts say about this Derale Transmission Coolers

  • Derale Transmission Fluid Cooler For a 2006 GMC Sierra 2500HD With AN Transmission Lines
    To attach the Derale 19-Row, High-Performance, Stacked-Plate Cooler # D51978 you will need to get the correct fittings to match your AN fittings you added to your transmission lines. Derale -6 AN Aluminum Fitting # D59006 Derale -8 AN Aluminum Fitting # D59008 Derale -10 AN Aluminum Fitting # D59010 Derale -12 AN Aluminum Fitting # D59012 You will be able to run the lines directly to the cooler and remove the lines that go into the radiator. I do recommend using a Edge Insight CS2 Comprehensive...
    view full answer...

Info for this part was:

Employee DeAnne T
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Expert Research:
Jameson C

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