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

Derale Combination Transmission and Engine Oil Cooler for GM Applications

Part Number: D15903
$146.99
Retail:$228.23
You Save: $81.24
Transmission Coolers
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Derale Standard Mount Transmission Coolers - D15903
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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. Great 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 1-800-940-8924 for expert service.
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  • Reviews (15)
  • Q & A (0)
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Derale Transmission Coolers - D15903

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

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

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:

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:

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:

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:

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:

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:

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.



by:

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:

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:

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:

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



by:

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



by:

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



by:



by:

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


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See what our Experts say about this Derale Transmission Coolers

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    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...
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  • 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.
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  • 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.
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  • 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,...
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  • 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.
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  • 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...
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  • 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...
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  • Will Derale Combination Transmission and Engine Oil Cooler for GM Vehicles fit my 2006 GMC Savana
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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  • 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...
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  • 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.
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    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.
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  • Troubleshooting Overheating While Towing Boat with 2015 Grand Cherokee V6
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    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...
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Do you have a question about this Transmission Cooler?


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
Employee Andy C
Installed by:
Andy C

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