bing tracking image
  1. Transmission Coolers
  2. Derale
  3. Transmission and Engine Cooler
  4. With 11/32 Inch Hose Barb Inlets
  5. 17W x 12-1/2T x 3/4D Inch
  6. Standard Mount
Derale Combination Transmission and Engine Oil Cooler for GM Applications

Derale Combination Transmission and Engine Oil Cooler for GM Applications

lowest price pledge
Retail:$159.00
Our Price: $126.81
You Save: $32.19
Transmission Coolers
This item qualifies for Free Shipping
Shipping Weight: 9 lbs
Quantity: 
Derale Standard Mount Transmission Coolers - D15903
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Need help with installation?
Locate installers near me
17" Wide x 12-1/2" tall x 3/4" deep, tube-fin cooler improves your vehicle's overall performance by ensuring proper fluid temperatures for both its engine and transmission with one compact system. Lowest Prices for the best transmission coolers from Derale. Derale Combination Transmission and Engine Oil Cooler for GM Applications part number D15903 can be ordered online at etrailer.com or call 1-833-496-1390 for expert service.
  • All Info
  • Reviews (15)
  • Q & A (0)
  • Photos
  • Why etrailer?

Derale Transmission Coolers

  • Transmission and Engine Cooler
  • With 11/32 Inch Hose Barb Inlets
  • 17W x 12-1/2T x 3/4D Inch
  • Standard Mount
  • Derale

17" Wide x 12-1/2" tall x 3/4" deep, tube-fin cooler improves your vehicle's overall performance by ensuring proper fluid temperatures for both its engine and transmission with one compact system.


Features:

  • Keeps both engine and transmission cool with just 1 system
    • Engine oil and transmission fluid flow through separate tubes inside the same core for effective, simultaneous cooling
  • Improves functioning and overall performance of transmission and engine
  • Extends life of both transmission and engine and prolongs period between necessary fluid changes
  • Cuts down on heat-related failures
  • Designed with copper tubing expanded into aluminum fins for maximum heat transfer
    • Copper is the best material for conducting the heat out of the fluid while aluminum is ideal for transferring and dissipating that heat
  • Protected from possible damage during installation by plastic fin guards and powder coat finish
  • Includes:
    • Thermostatic sandwich adapter to provide external oil lines
    • 13/16-16 Sleeve nut for GM applications
    • High-temperature, OEM spec hose with stainless steel clamps
    • Nylon mounting rods with pads
    • Bendable, metal mounting brackets
    • Insta-dapt radiator adapter
    • All necessary hardware
  • Made in USA


Specs:

  • Inlets: 11/32" hose barb
  • Dimensions: 17" wide x 12-1/2" tall x 3/4" deep
  • Engine filter thread size: 13/16"-16
  • 1-Year warranty


15903 Derale GM Combo Transmission and Oil Cooler with Installation Kit

Item # D15903

Installation Details D15903 Installation instructions




Customer Reviews

Derale Combination Transmission and Engine Oil Cooler for GM Applications - D15903

Average Customer Rating:  4.1 out of 5 stars   (15 Customer Reviews)

17" Wide x 12-1/2" tall x 3/4" deep, tube-fin cooler improves your vehicle's overall performance by ensuring proper fluid temperatures for both its engine and transmission with one compact system.

by:

The customer service is excellent thanks for the product. It is exactly as on the web site. Installing it on my truck. Honest, honorable people. I will continue to do business with. Thanks again




by:

Tranny side had no problems. Oil side kept leaking and was eventually disconnected. Hose clamps for hoses need to be replaced with sealed units.




by:

The kit is excellent, with a great price. I haven’t installed it yet. The kit doesn’t include the reducer for the smaller hose. Fast shipping and great support. Detailed Instructions would be extrodinarilly helpful.




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


Package was delivered on time. Installed it the next day. Didn't realise it's for oil and transmition. Just needed the oil cooler. Either way it's installed. Took a bit as I mounted in a different location than in front of radiator. Only did the oil. Already have a trany cooler. However I might loop into the other side for a trany and use the whole radiator. So far so good




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


Without a video for my 2014 explorer and with limited written instructions I chose to find a repair shop that would do the installation. It cost me $360 to have the dual cooler installed. Most places won't consider third party parts to install and others that wanted to charge from $600 - $800 to install. Removing the front cowling, bumper, & headlights proved to be too big of a challenge without adequate instructions. Also following the installation I drove cross country pulling a trailer and I didn't trust my self with the work, and at near 70 years I no longer want to tackle such a job. Other than above I made it to California with out incident.
PS, it would have been helpful for an estimate of the additional engine oil and transmission fluid it would take to fill the new system.




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


This is a good product and installation was fairly straight forward. The directions do not address the transmission connection to the cooler. If it did, someone would have realized a part was missing from the kit. If you are installing this cooler on a Dodge you will need a different connector than the one provided. Dodge uses a snap in, rather than screw in, connector for the transmission line. I only discovered this by watching a video online which actually gives the Derale part number for the connector (I don't remember what it is). I explained this to the customer service agent and he did not believe me nor would he send me one for free. Since I ordered this kit specifically for a Ram I feel this adaptor should have been included in the kit. Disappointed about that, otherwise it seems like a good kit. I haven't tested it yet since I am waiting for the adaptor.




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


I have not had a chance to install this unit yet. From the looks of it though it is worth it. Install should be a breeze too. I purchased this for a 05 Dodge Caravan. It cam with all the different oil filter adapters color coded for the filter you use.


Comments
How was the install? Are you happy with it? Any things you wished you knew before you began the install?- thanks. - getting ready to do the same
-- comment by: Chris d - 11/29/2015



by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


Easily installed to an 05 town and country. I think the 3/8 compression/ barbed fittings should be included in the kit though. Also do yourself a favor and make sure you get the hoses on the cooler before you tie it in place cause they go on HARD. Otherwise pretty simple. Installing for towing purposes. Took about 1 hour complete.




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


I haven't had the transmission cooler installed yet but the service I received in ordering and the shipping was way above what I ever expected. Very friendly customer reps and they know their job.




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


I installed the etrailer derale transmission cooler on my 2012 Toyota Tacoma. Hauled home a 3500lb tractor 3000 miles up hilly terrain and had no problems at all. Works great.




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


This cooler does a good job keeping transmission oil engine oil cooler.




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


Everything arrived intact, no damage. Instructions were clear. Products were put on with ease. Thanks




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


Received it packaging was great the cooler was in perfect condition all items seem accounted for. Cant wait to install it.




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers


This kit was easy to install on my application and works very well.




by:

Review from a similar Combo Trans and Engine Cooler in Transmission Coolers




15
15

See what our Experts say about this Derale Transmission Coolers



  • Will Derale Combination Transmission and Engine Oil Cooler for GM Vehicles fit my 2006 GMC Savana
    Transmission and oil coolers are universal items, save for the fittings. The Derale Combination cooler may work on your van, but you will have to measure the space available in front of your radiator. This dual cooler measures 17 inches wide, 12-1/2 inches tall and 3/4 of an inch deep. If there is enough space for this cooler to fit in front of your radiator then it will work with your vehicle.
    view full answer...
  • Recommended Transmission and Engine Cooler for 1998 GMC K1500
    For your 1998 GMC K1500, I recommend looking at the Derale Combination Transmission and Engine Oil Cooler # D15903. This is a great tube-fin cooler that will keep both the engine and transmission cooler with one compact system. The unit measures 17 inches wide, 12-1/2 inches tall, and 3/4 inch deep, so you will just want to make sure you have enough room between the grille and AC condenser on your truck for it to install. This system includes the 13/16-16 sleeve nut for GM trucks. I have...
    view full answer...
  • Best Engine Oil and Transmission Cooler for a 2009 Chevrolet Tahoe with the 5.3L V8 Engine
    The Derale Combination Transmission and Engine Oil Cooler for GM Applications part # D15903 does not have a class rating. The class ratings are a guide that we use to help consumers pick the correct transmission cooler for their towing setup. They are not used by the manufacturer but I would say the above cooler is a class IV which will be more than suitable for your 2009 Chevrolet Tahoe with the 5.3L V8 engine. In regards to installation, you will need to use the included plastic rods,...
    view full answer...
  • Engine Oil and Transmission Fluid Cooler Recommendation for 2005 Chevy Express Van
    Best solution would be a combination engine oil and transmission fluid cooler for your 2005 Chevy Express Van like the Derale kit part # D15903. This comes with all the fittings, lines and brackets needed to install in your vehicle. The oil filter fitting is a match for what your van has as well since it's designed for GM applications.
    view full answer...
  • Recommended Oil and Transmission Coolers on 2009 GMC Sierra 6.6L Diesel
    On your 2009 GMC Sierra with a 6.6 L Diesel I suggest the Derale Combination Cooler # D15903. This is both a transmission and engine oil cooler in one so you won't have to install two coolers. I've linked an install video that will show you the process.
    view full answer...
  • Combination Transmission And Engine Oil Cooler For 2009 Chevrolet Surburban
    Adding a cooler to your 2009 Chevrolet Suburban will help extend the life of your transmission and help increase the performance. We do offer a transmission and engine oil cooler designed for GM vehicles. It is part # D15903. This cooler has the same dimensions as the cooler you referenced. It has the 13/16 inch - 16 threads designed for GM applications. The Derale Combination Transmission and Engine Oil Cooler with Multiple Threads, part # D15902 has multiple sleeve nuts and includes...
    view full answer...
  • Combination Oil Transmission Cooler Recommendation for 1991 Chevy K1500 5.7L
    The Derale Combination Transmission and Engine Oil Cooler # D15903 would be a great choice for you except it does not come with the correct filter thread size. You need M18-1.5 mm and this comes with 13/16"-16. So instead you would want the # D15902 which does include this size for the threads. The sandwich adapter has a thermostatic bypass that will allow the engine to reach operating temperature before it starts to cool the oil.
    view full answer...
  • Are Additional Items Needed to Install Derale Transmission/Oil Cooler # D15903 in 2008 Silverado
    A good first step in selecting a supplementary cooler for your 2008 Chevrolet Silverado with factory heavy duty cooling package is to confirm that there is sufficient space for mounting the cooler you prefer, combination trans/oil cooler part # D15903 from Derale. This unit measures 17-inches wide x 12-1/2-inches tall x 3/4-inches deep. You want to ensure there is enough space for both the cooler itself plus for the lines to be able to make gentle bends (no sharp right-angle turns) to ensure...
    view full answer...
  • Combination Transmission and Oil Cooler for a 1996 GMC C/K Series 1500 with 5.7 Liter 350
    Transmission coolers/oil coolers are not vehicle specific so you can install # D15903 on your 1996 GMC C/K series truck with the 5.7 liter as long as it has an automatic transmission. This combination cooler does have the proper thread type for the oil filter on a GMC truck. But for the transmission cooler part I recommend adding fitting # D13035 so you will not have to cut and flare any transmission lines. With these items you will not need anything else for the installation. I have...
    view full answer...
  • Combo Tranny/Engine Oil Cooler That Fits 2007 Chevy Silverado New Body
    The Derale transmission/oil cooler combo part # D15903 would be the correct fit for your 2007 Chevy Silverado New Body truck as it comes with just the correct adapter you'd need to fit your truck.
    view full answer...
  • Will Derale Combination Transmission and Engine Oil Cooler # D15902 Fit 2007 Toyota Tacoma
    Derale Combination Transmission and Engine Oil Cooler # D15903 that you referenced is intended for GM vehicles and so is not be a correct fit for your 2007 Toyota Tacoma. The combo cooler # D15902 is the correct option for your Toyota. An installation video is linked for you along with the written instructions.
    view full answer...
  • Is 210 Degrees for Transmission Fluid and 235 Degrees for Engine Oil Too High While Towing
    If the transmission fluid temperature gets over 200 degrees Fahrenheit then you are reducing the life of the transmission so yes, I do recommend adding an additional larger transmission cooler. In regards to engine oil temperature, 235 degrees Fahrenheit is pretty normal, maybe a tad high. The Derale Combination Transmission and Engine Oil Cooler part # D15903 for GM or part # D15902 for all others would be a great addition helping with both engine oil and transmission fluid.
    view full answer...
  • Troubleshooting Overheating While Towing Boat with 2015 Grand Cherokee V6
    Your 2015 Jeep Grand Cherokee V6, the towing capacity is greater than that, however you still need to use caution. Your owners manual suggests not using ACC at all during towing. It also states that you should follow the gauges which may be more sensitive to heat when towing to remain safe. It could be that your thermostat is misreading, but it is very likely you need to add a cooling system which is normally included with a towing package. Adding coolers will only help your vehicle...
    view full answer...
  • Oil Cooler and Combination Oil and Transmission Cooler Recommendations for a 2001 Chevy Silverado
    On your 2001 Chevy Silverado, the o-ring diameter will either be 2-3/4 inches or 3-1/2 inches. Either way oil cooler kit # D15405 has both and will fit. It also comes with the proper filter thread size which will be 13/16-16, 18 mm x 1.5 mm, or 22 mm x 1.5 mm. Going with a combination cooler for oil and transmission fluid is not a bad idea. You could use # D15903 for GM applications or # D15902 which has multiple thread sizes. If more cooling is needed for each system you would want to...
    view full answer...
  • Recommended Engine Oil and Transmission Cooler for a 2010 GMC Yukon Denali AWD
    The Derale Combination Transmission and Engine Oil Cooler part # D15902 would be the best option for your 2010 GMC Yukon Denali AWD because the Derale Combination Transmission and Engine Oil Cooler for GM Applications part # D15903 does not come with the correct oil filter thread adapter you need which is a 22 mm x 1.5 mm. The Derale Combination Transmission and Engine Oil Cooler part # D15902 does come with the 22 mm x 1.5 mm oil filter thread adapter you need. The only other thing you...
    view full answer...
  • Oil/Transmission Cooler Installation in GMC Yukon XL
    In the two Derale combination oil/transmission fluid cooler kits # D15902 and # D15903 the actual cooler core part is the same, measuring 17" wide x 12-1/2" tall x 3/4" deep, but the difference between the kits is that part # D15903 is a GM-specific kit while the other is a universal kit with more parts to allow it to work in more applications. These extra component parts are the reason for the higher cost. For your Yukon you will use # D15903 along with Snap-In Radiator Adapter # D13035. I...
    view full answer...
  • Transmission And Oil Cooler Recommendation For 2007 GMC Sierra New Body Truck With 4.8 V8
    We do offer both options for coolers that will work for your 2007 GMC Sierra New Body truck. I have attached a drawing that shows the best location for mounting a cooler, if room allows. If you are interested in a transmission cooler only, I recommend the Derale Transmission Cooler, part # D13503. This cooler measures 11 inches wide x 8-3/4 inches tall x 7/8 inch deep. This is a plate-fin cooler which is very efficient, and will help improve your transmission overall performance. I have...
    view full answer...
    Image 1 for
  • Will Derale Combo Transmission and Engine Oil Cooler # D15903 Fit 2005 Chevy Silverado LT 5.3L V8
    In normal conditions I think that the Derale Combination Transmission and Engine Oil Cooler, # D15903, would work fine for your 2005 Chevrolet Silverado, but since you mention the Mojave Desert, this is going to be a different story. With excessive desert temperatures, it is going to take quite a bit more to cool the transmission fluid and engine oil. In this case I would use 2 separate coolers and go with the largest ones possible. Of course you will want to take a measurement to see...
    view full answer...
  • How to Increase Towing Performance with a 2006 GMC Sierra 3500
    In order to determine the maximum gross trailer weight (GTW) that you can haul with your 2006 GMC Sierra 3500, you will need to find both the gross combined weight rating (GCWR) and the gross vehicle weight (GVW). If you subtract the GVW from the GCWR that will give you the maximum GTW you can safely tow. These figures can be found on the white tag inside your driver's door jamb. Unfortunately, the towing capacity of your truck will not change even with the addition of performance enhancements....
    view full answer...
  • Cooler Options to Prepare 2011 Buick Enclave CXL for Trailer Towing
    According to the online information I found for your 2011 Buick Enclave CXL with front-wheel-drive, the vehicle is rated for a maximum trailer weight of 2000-lbs unless it is equipped with the trailer towing package, in which case its towing capacity increases to 4500-lbs. Both of the 2-inch hitches we offer for your Enclave have a 5000-lb towing capacity but since the vehicle is rated lower, that lower vehicle towing capacity becomes your actual working limit. The hitch I recommend is...
    view full answer...
  • Solution For 2008 GMC Sierra 1500 5.3L Overheating When Towing 4,000 lb Trailer Up a Grade
    If you are pulling a trailer under the towing capacities of your 2008 GMC Sierra 1500, the engine temperature of the truck should not overheat. I would recommend having the vehicle looked over by your GMC dealership. What I would recommend is adding a combination transmission and oil cooler, as well as a cooling fan. This will cool the transmission fluid, the engine oil, and engine. For this, I would recommend the Derale Combination Transmission and Engine Oil Cooler, part # D15903. You...
    view full answer...

Do you have a question about this Transmission Cooler?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality transmission coolers for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate transmission cooler information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee DeAnne T
Updated by:
DeAnne T
Employee Daron K
Updated by:
Daron K
Employee Patrick B
Expert Research:
Patrick B
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.