1. Transmission Coolers
  2. Derale
  3. Tube-Fin Cooler
  4. Class III
  5. With 11/32 Inch Hose Barb Inlets
  6. 15-1/4W x 7-1/2T x 3/4D Inch
Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class III - Economy

Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class III - Economy

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Transmission Coolers

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Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class III - Economy Standard Mount D12903
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15-1/4" Wide x 7-1/2" tall x 3/4" deep, reliable, all-aluminum tube-and-fin cooler extends the life and improves overall functioning of your vehicle's transmission. Lowest Prices for the best transmission coolers from Derale. Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class III - Economy part number D12903 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (93)
  • Q & A (17)
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  • Why etrailer?

Derale Transmission Coolers

  • Tube-Fin Cooler
  • Class III
  • With 11/32 Inch Hose Barb Inlets
  • Derale
  • 15-1/4W x 7-1/2T x 3/4D Inch
  • Standard Mount

15-1/4" Wide x 7-1/2" tall x 3/4" deep, reliable, all-aluminum tube-and-fin cooler extends the life and improves overall functioning of your vehicle's transmission.


Features:

  • Improves functioning and overall performance of transmission
  • Extends life of transmission and prolongs period between necessary fluid changes
  • Cuts down on heat-related failures
  • Agitates fluid with built-in, embossed turbulators for more efficient cooling
  • Constructed of durable, lightweight aluminum
    • Thermal-conductive metal provides excellent transfer of heat
  • Includes:
    • High-temperature, OEM spec hose with stainless steel clamps
    • Nylon mounting rods
    • Insta-dapt radiator adapter
  • Recommended for mid-size cars, trucks and SUVs
  • Imported


Specs:

  • Inlets: 11/32" hose barb
  • Overall dimensions: 15-1/4" wide x 7-1/2" tall x 3/4" deep
  • Core width: 12-1/4"
  • Distance between inlets: 6-1/4"
  • 1-Year warranty


Note: The Derale Insta-dapt radiator adapter fits most vehicles with 5/16" transmission lines, but not all. In some cases, additional fittings or alteration of the OEM lines or hoses may be required for installation.


Perhaps the simplest type of heat exchanger, the tube-fin effectively cools a variety of automotive systems. The concept is simple: Fluid cools as it travels through the core by transferring heat out to the fins. The fins then provide the surface area necessary for sufficient heat exchange to take place, allowing the heat pulled from the fluid to dissipate into the surrounding air. Quick, easy and effective.

Dimensions

Replaces HH41013



12903 Derale Dyno-Cool Aluminum Tube and Fin Cooler with Installation Kit

Item # D12903

Installation Details D12903 Installation instructions

This Product Fits The Following Vehicles





Customer Reviews

Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class III - Economy - D12903

Average Customer Rating:  4.6 out of 5 stars   (93 Customer Reviews)

15-1/4" Wide x 7-1/2" tall x 3/4" deep, reliable, all-aluminum tube-and-fin cooler extends the life and improves overall functioning of your vehicle's transmission.

- D12903
by:

902137



- D12903
by:

works great for a simple upgrade. 794154



- D12903
by:
1994 Volkswagen Eurovan

Lacked one connector for my application. 671824



- D12903
by:

It appears that my transmission temp dropped about 40-60° adding this cooler. The hose was pretty hard to attach to the cooler, even with lubrication. The hose was also to small for my vehicle so I had to source other parts to make it work. I installed it on a 2017 explorer. 661750



- D12903
by:
2010 Chevrolet Avalanche

I just installed this on my chevy avalanche. Flipped the bottom brace around in order to mount to. The hardest part is getting the hoses on the cooler and over the return line. I ended up getting a 90 deg quick connection coming from the radiator instead of using the one I got from etrailer. This keeps the hose from bending as much. Also purchase the installation kit with a hose as you will need an extra hose. After install I wish I would have went with the next bigger unit which is 10 high instead of 7 1/2 as I had plenty of room. 591245



- D12903
by:
2007 Chevrolet Avalanche

I bought this cooler for my 2007 Chevy avalanche LTZ 4X4 with 5.3 motor. I also bought the adapter the adapter D13035 for my truck as well. It was a quick and easy install. I just got it installed on 2/2/2018 and took the truck for a drive and it has dropped my transmission temp at least 40 degrees. It took me around 40 min to install. Very Happy with this new addition to my truck. FYI if you buy this unit to make it easier i would order an extra Line because the one line will be cutting close to reaching location. 472461



- D12903
by:

Very good product works well. The reason for 3 stars, it's NOT a direct fit as described when I purchased the product. The transmission lines are fitted to the A/C condenser so they had to be cut and needed to buy a flaring tool to flare the cut transmission lines. I look at the product online and now there's a note stating altering OEM lines may be needed. This wasn't there when I purchased it which delayed my install for another day. 336579



- D12903
by:

All parts were as they were stated. I have not towed my boat for any distance yet to see how well it lowers the temp of my transmission. Idid have to buy some more because I came up about 6" to short. 138046



- D12903
by:

Just got it in the mail the other day. Fast shipping, never have had an issue. Having it installed right now. Feels like it is well constructed and should do the job. We shall see what happens. 18179


Comments
What is the rated towing weight for a 1999 Honda CR-V? Does a trannie cooler install fairly easily on the Honda CR-Vs? What is the most effective mounting location for the finned cooler? How does the addition of a trannie cooler effect the volume of fluid and fluid level reading on the dip stick? Thanks for your time and expertise.
-- comment by: Robb B - 10/22/2013

2225

The towing capacity question is a loaded one. For that, I would refer back to the owners manual. It can vary depending on engine, transmission, drive configuration and more. Furthermore, Honda has some very specific guidelines regarding towing so it's best to defer to them. Installing a trans cooler on a full size truck can be easier because of the extra space, but it is not particularly difficult on any vehicle. We actually have a video of a cooler being installed on a 2006 C-V. We remove the front bumper cover for the video, but you may find you do not need to. (See link). The most effective location will be in front of both the radiator and the A/C condenser. As you move behind each cooling device, the efficiency diminishes. We put ours in front of everything on the 2006 in the video. For fluid capacity, plan on an extra 1/2 quart. Depending on cooler size and construction, it will vary some, but 1/2 qt. is a good rule of thumb.

-- Patrick B - 10/23/2013


- D12906
by:

Review from a similar Dyno-Cool in Transmission Coolers


Works great thanks mine got a hole in it and i replaced it with this one. 130315


Comments
Best thing iv ever invested in an at a great price
Ron - 05/13/2015

11649

- D12904
by:

Review from a similar Dyno-Cool in Transmission Coolers


works well, wouldn't buy one any smaller than this one. 529302


Comments
No issues, good product, thanks etrailer.
Doug - 07/02/2019

57374

- D12904
by:

Review from a similar Dyno-Cool in Transmission Coolers


Super easy install. With the installation video on Youtube it took out any of the guess work. The hose could stand to be about 3" - 5" longer if you are going to center in the A frame of an older chevy grill (I have an 06 Avalanche. I had to offset to the passenger side to use the supplied hoses) But, you can get a longer hose easy enough. Just ran over the pass and back and no leaks. Looks good so far! 377410



- D12906
by:

Review from a similar Dyno-Cool in Transmission Coolers


This product is great and installation was not bad at all. Only issue I had was that the GM radiator adaptor should come with this unit when you purchase it for a GM truck. Not as an add-on. Thought I could get it at GM but no go. I Had to work with hoses over 30 min to get them over the fittings even with trans. fluid on the hose and male fitting. So far it looks like trans temp has dropped 30 dg. 134485



- D12906
by:

Review from a similar Dyno-Cool in Transmission Coolers


Ive got a 1999 4runner that had the unfortunate luck of having the integrated transmission cooler line rupture inside my radiator. needless to say, the transmission didnt agree very well with having engine coolant running through it and finally died out on me. I bought this transmission cooler to isolate the transmission and the engine cooling systems. The cooler arrived a day ahead of schedule, which is always a bonus. I didnt rate it at 5 stars because I havent had a chance to install it yet and see how it performs, but judging by the reviews that I have read so far, the customer service provided and the prompt delivery, I would say that this transmission cooler will keep my truck running for a good long while. Everything pictured arrived in the box and I have no doubt that it will perform as expected. I will definitely recommend this product and this company to my friends! 30988



- D12906
by:

Review from a similar Dyno-Cool in Transmission Coolers


I ordered this cooler for my daughter's 2012 Nissan Rogue to fix CVT transmission heating up causing it to into limp mode. When I got ready to install, I found there was no place to connect the hoses to the transmission. The vehicle only had the direct "bee hive" cooler. Install was delayed while waiting to get a "4 tube bee hive" from a different supplier for an additional $114. 551625



- D12906
by:

Review from a similar Dyno-Cool in Transmission Coolers


A simply outstanding experience. Great prices and customer service. Outstanding support with the web site videos. A true pleasure to deal with these folks. 808359



- D12902
by:

Review from a similar Dyno-Cool in Transmission Coolers


Worked great, was able to travel safely putting my minivan to work. Simple install with great instructions. Will extend the life and increase the value of your vehicle! 800997



- D12906
by:

Review from a similar Dyno-Cool in Transmission Coolers


We installed a tow package on our Ford Flex. The transmission cooler was challenging, but everything else went smoothly. The product works perfectly. 776534



- D12906
by:

Review from a similar Dyno-Cool in Transmission Coolers


The part itself was easy to install and it does what it is designed to do. Only trouble with installation was with the vehicle, I had to remove part of the front cover on my 09' Avalanche to get to it. Also, I wish I had bought a black one to blend in with the rest of the radiator. 705491



- D12733
by:

Review from a similar Dyno-Cool in Transmission Coolers


Installed this in a 2017 Honda Ridgeline. Mounted it above the factory cooler that was already in the truck. (Flat fin side towards the a/c condenser). I used the insta-mount zip tie kit and also the flex metal mounts to anchor the cooler to the top of the factory cooler bracket as close to the a/c condenser as possible. The vertical bracket (part of the truck) that runs right down the middle of the a/c condenser has to be cut. All fairly minor fabrication. Hack saw and hand drill stuff. The fan has to be reversed to become a pusher. Followed the hood release cable from the interior to run 12 volts to power the fan on at ignition. Haven’t hooked the trailer up yet so I don’t know if this will resolve the hot tranny situation. ( I could smell the tranny getting hot before especially when we stopped at lights). Change your fluid too. etrailer delivered quickly and the cooler was well boxed and untouched. 656607


Comments
We towed our travel trailer 7500 miles last fall almost coast to coast and back. The trailer weighs 4400 lbs loaded. The Ridgeline’s towing capacity is 5k lbs. I kept our speed at around 65 mph. The truck was capable even in mountain terrain. The transmission never overheated. I did change the fluid once during the trip and again when we got back. The cooler worked. Never once did I get that burning smell. I’m almost certain that the cooler saved us a huge overhaul repair. Thanks etrailer.
James - 06/12/2020

80577

- D12213
by:

Review from a similar Dyno-Cool in Transmission Coolers


Fast shipping and the best customer service. Looking forward to getting the coolers attached and will add some pictures. 628785



- D12904
by:

Review from a similar Dyno-Cool in Transmission Coolers


Fast Shipping Customer Service is Great. They sent me a list of everything I needed. 615223



- D12906
by:

Review from a similar Dyno-Cool in Transmission Coolers


good show cost effective wood by again 599189



- D12906
by:

Review from a similar Dyno-Cool in Transmission Coolers


Great for the money free shipping anytime you are pulling a heavy load you should always have this 584833



- D12906
by:

Review from a similar Dyno-Cool in Transmission Coolers


I purchased this for my C6 Corvette A6 transmission. I did, however, bypass the radiator and only use the transmission cooler for the C6. I purchased and used the Derale Radiator Adapter fitting 259-13035 for both the top and bottom and just capped them off to keep debris out of the reservoir. I also had to make some custom mounting brackets. This is an excellent product and it keeps the tranny in a great temperature range. 552474


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Show More Reviews

Ask the Experts about this Derale Transmission Coolers

  • Transmission Cooler Recommendation for 2014 GMC Yukon XL with 6.2 L Engine
    The great thing about transmission coolers is that they're fairly universal in terms of vehicle fitments- the biggest concern is finding the largest cooler that will fit in the forward most available mounting position with your 2014 GMC Yukon XL. The largest cooler we have available for your Yukon XL Denali is the Derale Tube Fin Cooler # D12903 which is 15-1/4" long x 7-3/4" tall-which is the correct size to mount in front of the air conditioner condenser fan (the most preferable spot)...
    view full answer...
  • Does Transmission Cooler Install for 2004 Ford F-150 Require Hose Fittings
    You will want to use the hose fittings part # D13024 and # D13025 when installing the transmission cooler part # D12903 on your 2004 Ford F-150. They will make the process much easier and allow you to not have to cut and flare any hard lines.
    view full answer...
  • Do Push Rods of Derale Transmission Cooler Kit # D12903 Damage AC Condenser Fins
    Using the push rods of the Derale Dyno-Cool Tube-Fin Transmission Cooler Kit # D12903 will not cause any damage to the condenser of your vehicle. The fins are designed to be slightly bent and not be permanently damaged. Also, no amount of damage to the fins would cause a leak as they only attach to the outsides of the piping of the condensor. If the fins get damaged all they do is prevent the condenser from being able to cool as efficiently.
    view full answer...
  • How to Determine the Transmission Cooler Return Lin on a 1999 For F-150
    The easiest way to determine the return line on your 1999 Ford F-150 transmission is to start the truck, shift into drive but do not go anywhere. After about 15 seconds or so put the truck back in park and apply the emergency brake. Turn off the truck. Out of the 2 hoses attached to the transmission, one should be warmer than the other. The one that is cooler is the return line. It may sound a little too easy but it works.
    view full answer...
  • Transmission Cooler for 2015 Chevrolet Suburban
    The largest transmission cooler you can fit in front of your AC condenser will give you the most cooling efficiency so I suggest Derale Cooler kit # D12903 along with Hose Fitting kit # D13035 for the 5.3L V8 engine. This cooler measures 15-1/4 wide x 7-1/2 tall x 3/4-inch deep; you will want to check the space in front of your condenser to ensure there is enough room to mount the Derale. The inlets/outlets can point in any direction. You will want to ensure that you can access the...
    view full answer...
  • How To Find the Transmission Cooler Return Line From Radiator on a 1993 Chevy C2500
    The best way to determine which line on a transmission cooler is the return line from the radiator is to use the following procedure: 1. Start engine while engine is cold 2. Place transmission shift lever in drive for no more than 10 seconds 3. Place in Park, stop engine, and remove keys 4. Identify the oil return line by feeling both oil lines. The coolest line is the oil return line. On the aftermarket transmission cooler the ports are not input specific or output specific. It...
    view full answer...
  • Parts Needed to Flat Tow 1999 Honda CR-V
    A transmission cooler like Derale # D12903 is intended for a vehicle that is doing the work of towing a trailer rather than for a vehicle that is being flat towed. Your 1999 Honda CR-V can be flat towed with all wheels on the ground whether it is has a 5-speed manual transmission or an automatic transmission. The flat towing preparation procedure is slightly different for each type of transmission but in both cases you'll want to ensure the transmission fluid level is full and that you...
    view full answer...
  • Towing Capacity and Transmission Cooler Installation on a 1999 Honda CR-V
    I was able to find on the Honda website the specs for your 1999 Honda CR-V. The towing capacity is listed as 1000-lbs. Transmission coolers come in a variety of types and sizes. These items are not vehicle-specific, so you can install the largest cooler for which you have space to mount it. The best location within the engine compartment is in front of the air conditioner condenser as this placement provides maximum air flow and hence best cooling. I have linked two articles that provide...
    view full answer...
  • Do I Need to Identify Transmission Cooler lines to Run an Aftermarket Cooler In-Line with Factory
    You will need to determine the flow of the transmission fluid in order to install the aftermarket cooler in-line with the factory. The fluid needs to travel from the transmission, to the factory cooler, to the aftermarket cooler, then back to the transmission. One of the fittings on your transmission should be marked RETURN. Trace this line back to the factory cooler. Disconnect this line from the factory cooler, and reconnect it to which ever end of the aftermarket cooler you choose...
    view full answer...
  • Recommended Transmission and Power Steering Cooler Options for 2002 Ford F-250 with 6.8L V10 Engine
    For your 2002 Ford F-250 with 6.8L V10 engine the most popular transmission cooler option is the Derale Class III model # D13503 which installs with Radiator Adapter kit # D13025. This cooler measures 11 x 8-3/4 x 7/8-inches and it is best installed in front of your AC condenser where it will receive the most direct air flow. A video is included for you. The cooler can be installed with the two connection ports facing in any direction. Another option is to use a pan-style cooler. A pan...
    view full answer...
  • Transmission Cooler for a 2008 Ford F-150 4.2 Liter Towing 5,000 Pound 5th Wheel Trailer
    The most popular cooler for towing capacities of around 5,000 pounds is # D13504. This cooler is 11 inches wide, 12 inches tall, and 7/8 inches deep. Provided you have space for a cooler, and on a 2008 Ford F-150 you surely do, this cooler will work great for you. I have linked a video review of the cooler, the instructions, and a help article on coolers.
    view full answer...
  • Available Class III Transmission Coolers for 2018 Ford F-150 with 2.7L V6 EcoBoost Engine
    We offer transmission coolers for your 2018 Ford F-150 with 2.7L V6 EcoBoost engine at several different price points. All are displayed on the linked page. The Derale transmission cooler # D13503 is rated as a Class III cooler. They also offer a slightly smaller and less costly Class III model, part # D13502 and also the larger Class III model # D12903. A slightly less-efficient Class II cooler is offered, part # D12906. For best overall value and performance I recommend transmission...
    view full answer...
  • Transmission Cooler Recommendation for a 2007 Chevy Suburban Towing a 5,900 Pound Travel Trailer
    Adding weight distribution will help to divide the gross trailer weight more equally to all the axles of the Suburban and trailer, but all the weight will still be there. While weight distribution is a good idea for a trailer this size, the best solution, and most economical, is to add a transmission cooler. I recommend the Derale Dyno-Cool Tube-Fin Transmission Cooler Kit, # D12903. It is rated for up to 6,000 pounds gross trailer weight and will help to keep the transmission fluid...
    view full answer...
  • Best Solution for Lowering Vehicle Temperatures When Towing
    The added stress from trailer towing usually shows up as an increased transmission temperature. I am not sure if the gauge you're referring to is displaying engine coolant temperature or if you have one that shows transmission temperature. We do offer Derale Class III transmission cooler # D12903 for your 5.3L Yukon XL which measures a generous 15-1/4 x 7-1/2. This can be mounted in front of your AC condenser to provide supplemental transmission cooling after the OEM cooler in the radiator...
    view full answer...
  • Recommend Derale Aluminum Tube Fin Transmission Cooler For a Snowmobile
    We do have all aluminum coolers available, they are the 6000 series coolers from Derale. Checkout the Derale Dyno-Cool Tube-Fin, part # D12901, which is an all aluminum cooler. The # D12901 cooler measures 13 inches wide, 5 inches tall, and is 3/4 inches thick. You will need to measure to see if you will have room on your snowmobile to mount the cooler. We do not have an aluminum tube fin cooler as small as the Derale # D13212 cooler that you referenced. For other aluminum coolers...
    view full answer...
  • Comparing Plate-Fin and Tube-Fin Transmission Coolers for a 2019 Ford F-150
    Out of the Derale # D13503 and # D12903 I recommend going with the former over the latter on your 2019 Ford F-150. Reason being that the part D13503 is a plate-fin cooler which is more efficient than the D12903 which is a tube-fin cooler. I have attached some helpful articles to help you determine where the best location is to mount the cooler on your F-150.
    view full answer...
  • Recommended Transmission Cooler for 2016 Chevy Silverado 1500
    Transmissions should operate at right around 200 degrees ideally. The 215 degrees is a little concerning as 220 is recognized to reduce power and the life of the transmission, so I do recommend adding a transmission cooler to your truck. I recommend the Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class III - Economy # D12903 to assist in cooling your transmission to keep your truck functioning well.
    view full answer...

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Info for this part was:

Updated by:
DeAnne T
Updated by:
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Expert Research:
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Expert Research:
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Expert Research:
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Expert Research:
Adam R

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