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  1. Transmission Coolers
  2. Derale
  3. Tube-Fin Cooler
  4. Small SUV
  5. With 11/32 Inch Hose Barb Inlets
  6. Standard Mount
Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class II - Economy

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

Our Price: $43.06
You Save: 16%
Transmission Coolers

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13" 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. Great Prices for the best transmission coolers from Derale. Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class II - Economy part number D12906 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (125)
  • Q & A (0)
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Derale Transmission Coolers

  • Tube-Fin Cooler
  • Small SUV
  • With 11/32 Inch Hose Barb Inlets
  • Standard Mount
  • 13W x 7-1/2T x 3/4D Inch
  • Derale

13" 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.


  • 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 small to mid-size trucks and SUVs
  • Imported


  • Inlets: 11/32" hose barb
  • Overall dimensions: 13" wide x 7-1/2" tall x 3/4" deep
  • Core width: 10-1/8"
  • 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.


Replaces 41011

12906 Derale Dyno-Cool Aluminum Tube and Fin Cooler with Installation Kit

Item # D12906

Installation Details D12906 Installation instructions

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class II - Economy - D12906

Average Customer Rating:  4.6 out of 5 stars   (125 Customer Reviews)

13" 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.

2009 Audi A6

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.


Wanted to give my Honda better ability to handle a tow. this baby does the job. Transmission definitely cooler operation since the install. The install was simple and straight forward.

Dan L.


so far so great. Tho sometimes I have to remind the transmission service guys to add a bit more fluid then they are use to.

2005 Honda Pilot

After one of use on a 2005 Honda Pilot, everything is holding up just fine. The one star less is because of the difficulty in installing it on this particular vehicle. Although this is a universal component, it is MUCH easier to install on pickup trucks. Best of luck with a brand new rubber hose going on with any sort of ease.

Etrailer Expert

Rachael H.


Our installers typically use some transmission fluid to make installing the rubber hose on the Insta-dapt fitting easier.

Jeep Grand Cherokee

Can't say anything bad about the unit. It was installed in a Jeep Grand Cherokee that I use to haul trailers occasionally that weigh up to 6000 lbs. So far, I've never overheated the transmission at all, which I attribute to the addition of this cooler. Once again, thanks for a great product.


Very easy install, absolutely no leaks anywhere in the system after putting it into service. I did have to get additional hose for the install due to the location I chose for the cooler (personal preference). I centered it on the bumper side of the radiator to provide the best air flow. Remember to get a quart of transmission fluid to accomodate the larger system volume after the install. I took my grill off to provide the most room for putting the cooler in rather than trying to wedge it between the radiator and grill, made install the nylon fasteners through the radiator and cooler much easier. Should last for many years.

1999 Toyota 4Runner

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!

2008 Chevrolet Silverado

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.

2012 Nissan Rogue

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.


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.

2006 Chevrolet Colorado

for my 06 colorado with the 2.8l i4. also used the derale trans oil thermostat to help with warmup of trans fluid in winter. trans never gets above 190F now and the engine will overheat (212F) before the trans does. perfect upgrade for a light duty truck/van/car to provide a little bit of cooling at a compact size. very satisfied with the product


The transmission cooler, along with all the other products I ordered from etrailer was an excellent buy. they arrived on time and in excellent condition. The best benefit of ordering from etrailer is the superior customer service. I was even able to talk directly with one of their installers when I had a question.


The trans cooler was easy to install. I had to go and buy some more hose and mounting screws to make it work but I knew that before I started. The hose was because of where I wanted it mounted. The trans cooler is keeping the transmission about 30 to 40 deg cooler then before.

1999 Ford Ranger

The tranny cooler was really simple to install. Everything you need is in the kit.It took about 45 minutes.
Great product. Delivery was quick.
Thanks to all, no picture at this time, trucks on the road.

Ford Flex

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


Nice inexpensive transmission cooler. Simple installation, although I didn't use the through radiator plastic ties supplied. Drops transmission temperatures well.

2013 Dodge Grand Caravan

Have not installed yet but the product looks great.'s service is so fast it's amazing. Dealt with them before and will not hesitate to deal with them again in the future. Great company.

2001 Jeep Grand Cherokee

Easy install, works great. Installed on a 2001 Jeep Grand Cherokee. I tow a 19' boat and haven't had any transmission issues since.


Easy to follow instructions. You will need to remove the front clip to install. Nothing too difficult.

2007 Honda Pilot

I was able to install this and the PS cooler in one afternoon. I am not a mechanic, but I am fairly handy. Your milleage may vary. All the parts were correct and fit my 2007 Honda pilot fine.

Honda Odyssey

hose provided could have been a little longer, but overall product was a good fit for our Honda Odyssey


Good reliable cooler and really good shipping and tracking!

2007 Chrysler Pacifica

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



Best thing iv ever invested in an at a great price


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

2002 Acura MDX

The item is good; exactly what I expect from description. Shipment was fast and it was packed good to avoid damage. Will buy product again in this company. Very satisfied!

2002 Chevy Tracker

Installed on a 2002 chevy tracker with ease. very well made and all parts provided were well thought out for the installation.

Show More Reviews

See what our Experts say about this Derale Transmission Coolers

  • How to Determine How Much Fluid Should be Added After Installing Transmission Cooler
    What you will want to do is check the transmission fluid level after installing the Derale part # D12906 and then add as much as needed. Most likely around a 1/2 qt would be needed but that will depend too on if you spill any fluid (most do) and how long of lines you use.
    view full answer...
  • Installation of Derale Dyno-Cool Transmission Cooler on 2010 Nissan Titan 4x4
    The Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class II - Economy # D12906 comes with the adapter fitting you need for your 2010 Nissan Titan 4x4. You won't need any additional part for this installation.
    view full answer...
  • Does the Derale Transmission Cooler Kit Come with What is Needed to Install on a 1997 Chevy Lumina
    The Derale Dyno-Cool Tube-Fin Transmission Cooler Kit, # D12906, comes with everything you will need to mount and install it on your 1997 Chevy Lumina. The system installs in line with your current transmission hoses. I have included an FAQ article on Transmission Coolers below. There is a lot of helpful information, including the best places to mount the unit. I have also included a video showing installation of a transmission cooler. Installation will be similar on your vehicle.
    view full answer...
  • Where is the Best Location to Mount the Derale Dyno-Cool Tube-Fin Transmission Cooler Kit
    The Derale Dyno-Cool Tube-Fin Transmission Cooler Kit, part # D12906, should be mounted after the radiator. So it would be in line from the fluid return line, this is the recommended way to install part # D12906. For mounting the unit, it is recommended that part # D12906 be mounted behind the grill and in front of the Air Conditioning Condenser Core, (see video link for reference). You can mount part # D12906, between the condenser core and the radiator but it will cut down on the cooling...
    view full answer...
  • What to do if a Transmission Cooler Line Comes off and Fluid is Leaked
    It really is hard to say, your best bet would be to repair the line if you have not already. Fill the transmission up with the appropriate amount of fluid and then take it to a transmission repair shop to have them check it out. Hopefully you get lucky, but there could be a wide range of potential internal problems depending on how long the vehicle was attempted to be driven and the temperature of the transmission.
    view full answer...
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  • Installation of Derale Transmission Cooler # D12906 on a 2003 Acura MDX
    A transmission cooler will attach in-line with the transmission fluid return line on your 2003 Acura MDX. 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. Stop engine and remove keys 4. Identify the transmission fluid return line by feeling both lines. The coolest line is the return line. You...
    view full answer...
  • Removal of the Front Bumper and Grill to Install a Transmission Cooler on a 2009 Subaru Forester
    From the research I did it looks like you will need to remove the front grill and bumper to install a transmission cooler like the Derale Dyno-Cool Tube-Fin Transmission Cooler Kit # D12906. There will be 16 plastic rivets that will need to be removed. You can use a screwdriver to pop them out. Take your time getting these out so you do not break them. Once the grill and bumper are removed you will have plenty of room to work to install a transmission cooler like the # D12906. I am going...
    view full answer...
  • Is the Hose Included with Derale Transmission Coolers Long Enough for Install on a 2004 Honda Pilot
    The hose that is included with the Derale transmission cooler, # D12906, is long enough for typical installation locations, including in front of the radiator, as long as it is on the same side as the factory transmission cooler lines. It is entirely possible on any vehicle, including a 2004 Honda Pilot, that you may need to acquire additional hose. I have yet to have a customer complain about the hose not being long enough. I have included some helpful links on transmission coolers for you.
    view full answer...
  • Transmission Cooler Recommendation for a 1996 Nissan Pathfinder Towing a 1900 lb Trailer
    There really is not a down side to using a transmission cooler on a vehicle. It has been proven that transmission coolers will prolong the life of a transmission. Especially when the vehicle is towing a trailer. I would strongly recommend you install one since you will be pulling a 1,900 lb trailer with your 1995 Nissan Pathfinder. The power switch might enhance the shift points so that it will perform better while towing, but it will not prevent excess heat from building up in your transmission...
    view full answer...
  • Does a Transmission Cooler Need A Thermal Bypass for Sub-Freezing Weather
    I have not ran into any issues where there was a thermal bypass needed for below freezing temperatures when using the Derale Dyno-Cool Tube-Fin Transmission Cooler part # D12906. There is a lot of heat generated when all of the parts get moving in there and a cool transmission is a happy transmission. I can't see the cooler over cooling the fluids to a point that there would be any negative effects. For your power steering I rarely see the need to cool it. Even when hauling a trailer you...
    view full answer...
  • Installing Transmission Cooler in 2006 Subaru Forester
    When installing your supplementary transmission cooler such as the economical Derale Dyno-Cool Tube-Fin Transmission Cooler # D12906 in your 2006 Subaru Forester you will want to locate the cooler in front of your AC condenser for maximum air flow and cooling efficiency. Please refer to the linked article. You want to install the supplementary cooler on the return line from the radiator. To determine which line is the return line you will want to start with your truck totally cooled off....
    view full answer...
  • Transmission Cooler for 2007 Jeep Grand Cherokee
    The Derale # D12906 is a universal-fit aftermarket part that will fit your 2007 Grand Cherokee if the space behind the grille and in front of the A/C condenser and radiator can accommodate its 13 by 7-3/4 inch dimensions. If the available space is to small to allow installation of the D12906, we have smaller plate-fin style coolers like part # D13502 that are actually more efficient at cooling your transmission fluid. This cooler would typically be installed so it would be last in line...
    view full answer...
  • Transmission and Power Steering Cooler Recommendations for a 2004 Acura MDX
    A transmission cooler would be a great idea for you. Especially considering the mileage on your vehicle, the length of your trips with the trailer, and since your vehicle manufacturer recommends one. I attached an FAQ on transmission coolers for you to check out also. Basically, the cooler you keep the transmission fluid, the longer the life of your transmission will be. The same is true for your power steering pump. The Derale Dyna-Cool Tube-Fin Transmission Cooler # D12906 that you referenced...
    view full answer...
  • What Transmission Cooler Kit is Best for a 2001 Saturn L300
    The D15505 is a bit larger than what a 2001 Saturn L300 would need or could fit. There are 5 recommended kits for your L300 based on the vehicle size and towing capacity. I have added a link to them below. Transmission kits are not vehicle specific. However, you need to make sure you have space to accommodate the cooler. On each of the cooler pages, you can find the dimensions of the cooler. Measure the space on your vehicle where you would like to mount the cooler and make sure you have...
    view full answer...
  • Recommend A Transmission Cooler For 2011 Subaru Outback V6 Towing Over 2000 Pound Trailer
    The item you selected, the Derale Transmission Cooler, part # D12906 will work on your 2011 Subaru Outback as long as you have room to mount it on your vehicle. The ideal place to mount a transmission cooler for maximum cooling efficiency is behind the grill of your 2011 Subaru Outback but in front of the radiator. You will want to measure at the front of your vehicle to make sure there is room to mount part # D12906 as it measures 13 inches wide and 7-1/2 inches tall. Another Transmission...
    view full answer...
  • Secondary Transmission Cooler For A 2000 Honda Accord V6 Needed
    The best way to select the correct transmission cooler is by determining where there is enough space to mount it. The attached diagram shows the best three positions to mount the transmission cooler in order. Transmission coolers are more efficient when they receive maximum air flow. The "A" transmission cooler location in the diagram is 100% efficient so a larger transmission cooler is not needed to compensate for the loss of cooling power. My recommendation is the Derale Dyno-Cool...
    view full answer...
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  • Recommended Transmission Cooler for a 2000 Buick Century
    A class I or class II transmission cooler should work well for your needs. I recommend class I transmission cooler # D13101, or a class II cooler like # D12906 would also work to help with the issue you are having during warm weather. Both of these Derale coolers are designed to cool very efficiently and install easily, and either one would be a good choice for your 2000 Buick Century. In addition to the transmission cooler, you would also need the custom fittings # 41418 to match the...
    view full answer...
  • Recommended Derale Transmission Cooler for 2012 Toyota RAV4 with 3.5L V6 Engine
    Adding a supplementary transmission cooler to a vehicle that tows a trailer is a great way to reduce the thermal stress on the transmission. For your 2012 Toyota RAV4 with the V6 engine the most popular cooler is the Class III Derale # D13503, and this also happens to offer the highest cooling efficiency of all such products available for your RAV4. This is a complete kit with all needed parts. I linked a couple of help articles on the topic of transmission coolers.
    view full answer...
  • 2006 Toyota RAV4 Transmission Cooler Recommendation
    As long as the transmission of your 2006 Toyota RAV4 has external lines you can install a transmission cooler. If you find the radiator there should be two metal lines that run to it that would be used for the factory cooler. You can also check out the transmission, if you find lines running from it those can be used for installing a cooler. The part # D12906 is a very popular option that would work well as long as you have room for it. I actually have it on my car and it does a great...
    view full answer...
  • Transmission Cooler Recommendation for 2012 Toyota RAV4
    For your 2012 Toyota RAV4 the Derale cooler part # D12906 would be a great option. We normally recommend going with the largest cooler that will fit in front of the radiator. In the case of this cooler it measures 13" Wide x 7-1/2" tall x 3/4" so you would need to measure the available room you have. A more efficient cooler that's a bit smaller is the part # D13503 which measures 11" Wide x 8-3/4" tall x 7/8" deep.
    view full answer...
  • Transmission Cooler and Oil Cooler for 2016 Toyota Tacoma With 3.5L V6
    Transmission cooler and oil coolers are universal, with the general rule being the larger the better; you just need to ensure you have the appropriate amount of space. The Derale Combination Transmission and Engine Oil Cooler with Multiple Threads # D15902 is 17" Wide x 12-1/2" tall x 3/4" deep which is large enough to give you the cooling you need. It's ideal fit is in front of or behind your radiator, as you can see by the linked installation instructions. I do recommend checking those...
    view full answer...
  • 2013 Jeep Compass and Patriot Transmission Cooler Recommendation
    While normally you can't install transmission coolers on vehicles with CVT transmission I was able to find people online who were able to and the install was the same as standard automatic transmissions. For both your 2013 Jeep Patriot and Compass I'd go with the Derale # D13502 which is a very efficient design and size that would work great for both vehicles.
    view full answer...
  • Transmission Cooler Recommendation for a 2008 Honda Pilot
    The main differences between the available transmission coolers is the style of the coolers and the size. There are style that are more efficient that others, and obviously the bigger the cooler the more efficient it is as well. The tube-and-fin style has a tube that carries the transmission fluid through the cooler. It is also distinguished by its turbulators, which agitate the fluid to get more of it to contact the aluminum in the tube. Aluminum fins are attached to the outside of the...
    view full answer...
  • Can a Transmission Cooler Bypass the Factory Cooler on a 2007 Nissan Pathfinder
    A lot of people with Nissan vehicles are looking to bypass the factory cooler contained in the radiator like on your 2007 Nissan Pathfinder. The coolers we carry are designed to supplement the factory cooler although some people have used them to replace the factory cooler. You would want to go with the largest cooler possible if you bypass the factory cooler and the inlet/outlets on the radiator for the factory cooler will have to be plugged. Or instead of the largest cooler you would...
    view full answer...

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