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Derale Radiator Adapter Fittings for GM

Derale Radiator Adapter Fittings for GM

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Quickly and easily install your new transmission cooler without having to go through the hassle of cutting and flaring lines. Fittings are designed to work specifically with your vehicle's radiator. 1-800-940-8924 to order Derale accessories and parts part number D13018 or order online at Free expert support on all Derale products. Great prices and Fastest Shipping for Derale Radiator Adapter Fittings for GM. Accessories and Parts reviews from real customers.
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  • Reviews (40)
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  • Videos (1)
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  • Why etrailer?

Derale Accessories and Parts

  • Transmission Coolers
  • Radiator Adapters
  • Derale

Quickly and easily install your new transmission cooler without having to go through the hassle of cutting and flaring lines. Fittings are designed to work specifically with your vehicle's radiator.


  • Connects radiator to transmission cooler quickly and easily - no cutting or flaring lines


  • 5/8" Inverted flare fittings
  • 1-Year warranty

13018 Derale GM Radiator Adapter
Hidden Hitch # HH41411
Hayden Automotive # 390

Item # D13018

Video of Derale Radiator Adapter Fittings for GM

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Review of Derale Transmission Cooler Adapter Fittings for GM - D13018

Michael Hi there. I'm Michael with Today, we're going to take a quick look at these Derale radiator adaptor fittings. These are going to make it much easier for you to install your new transmission cooler without having to go through the hassle of cutting and flaring your lines. These fittings are designed specifically to work with your 1996 with your 1996 and newer GM trucks with a 3/8 3/8 inch line. And this will connect your radiator to your transmission cooler without having to do any of those cutting and flaring steps.

These are 5/8 inch inverter, flare fittings. So they are going to just slide right in place and connect very easily for you, to save you a little bit of hassle and a few steps there. So if you are looking to add a new transmission cooler to your GM, this is going to be a great way to make that process a lot easier and quicker for you. So that's going to complete our look for today. Again, I'm Michael with

Thanks for watching..

Customer Satisfaction Score:

Customer Reviews

Derale Radiator Adapter Fittings for GM - D13018

Average Customer Rating:  4.6 out of 5 stars   (40 Customer Reviews)

Quickly and easily install your new transmission cooler without having to go through the hassle of cutting and flaring lines. Fittings are designed to work specifically with your vehicle's radiator.


So far the trans cooler has been working well. I also used the adapters. Both products are doing well after 1500 miles or so and many hills, mountains, and trailering.

100 happy with the trans cooler and adapter set. Temp stays nice and cool. Puts me at ease when towing my trailer.
DSJ - 06/02/2022


Great cooler upgrade for my 1997 GMC Yukon! Little delivery damage, but was so easy to bend those fins back to original shape so no worries!
Nice that you had proper dimension measurements online, so it was easy to figure out what kind I can fit in my truck. Complete kit had everything I needed to get it done!
Modified old cooler bracket little bit and that was it. Works great!


Very handy for unique installations fo transmission coolers


Worked just as needed


Will make the installation of the trans cooler easier


Just received my order today. I haven't installed the parts yet. They appear to be high quality though.


Got those radiator fitting male an female for my 97 Chevrolet ,worked perfect d13018 made easy job out of hooking up my trans cooler ! A must have .just wish I had got my trans cooler from etrailer they are a great company .so if you gonna put a trans cooler own you GM truck take my word for it you best go to trailer! Won't be sorry, thanks


2002 GMC Sonoma installed Tranny cooler no high temps when towing 2014 178 R-Pod

We have traveled over 4500 miles and all has worked great for us.
Tommy M - 01/20/2022


Pro help online to order. Trans cooler shipped right away.
Installed and working perfectly.


It looks like from reading the matierl if one is using the cooler in series with the factory cooler this adapter is not needed.
Thus I would like to return, but I fear the shipping cost will not make sense, dollar wise...

Thus the recommendation should state if you are adding a cooler to your system where one does not already exist, then you'll need this adapter.

So if your adding to an already existing system, you do not need the adapter.


Have I gotten my refund for trans cooler fittings that weren't needed? 1994 k1500 trans cooler is working great.


Work as advertised


Great buying experience, will definitely be a go to company for future purchases


Worked out great for installing the extra trans cooler.


Great product, very happy with it. Etrailer shipped it right away.


These fittings made connecting the hoses to the steel transmission lines very easy - glad I bought them! I recommend getting them.


The adapter fitting did not fit my 2008 GMC Sierra 1500 w/ 5.3 liter engine and factory trailer package.


I purchased these fittings thinking these would fit my GM product. NOT.......These are 3/8 and looks like the fit the truck series only as stated on the package. Be aware


Didn't use.


Exactly as described. Needed for my 2002 GM truck application


Does exactly what it is intended to do. It keeps the temp down while towing. Very easy to install as well.


Exact fit for my 2000 Chevy Silverado. What a time saver. I am glad that etrailer suggested these.


A must if your upgrading. Fits like a glove.


Excellent product it is performing flawlessly


Well worth the investment

Show More Reviews

See what our Experts say about this Derale Accessories and Parts

  • Preventing Radiator Fittings From Leaking
    Instead of pipe dope, Derale recommends using pipe thread seal tape like part # D15714 to prevent leaks.
    view full answer...
  • How Does Derale Radiator Fitting for Transmission Coolers Install on a 2002 Chevy S10 2.2 Liter
    The Derale transmission cooler fitting # D13018 is listed as a fit for your 2002 Chevy S10 2.2 liter. The fittings thread onto steel transmission lines and in the radiator so you will not have to flare the lines. I included a picture that illustrates this.
    view full answer...
    Image 1 for
  • How are the Derale Adapter Fittings # D13018 Installed and Used to Install a Transmission Cooler
    The male end of the Derale Radiator Adapter part # D13018 that you referenced does thread into the outlet side of the factory cooler in your radiator. The female side of this adapter would thread onto the male side of the coolant line that you removed from the factory cooler. I realize that's probably hard to visualize so I attached a diagram that shows how both sides of the adapter are used. I also attached an FAQ article on transmission coolers, plus a video of one being installed....
    view full answer...
    Image 1 for
  • Fittings for Installing Transmission Cooler on 1996 Chevrolet Silverado
    The Delrale # D13018 Adapter Fittings for GM, are the correct fittings for installing a secondary transmission cooler on your 1996 Chevrolet Silverado.
    view full answer...
  • Transmission Cooler Recommendation for a 2014 GMC Sierra 1500
    For your 2014 GMC Sierra 1500 I would recommend the larger transmission cooler part # D13504 as basically the larger the cooler you have the better, and your truck would have room for it's size of 11" Wide x 12" tall x 7/8" deep. For a fitting that would allow you to install the cooler without having to cut or flare any lines you would want the part # D13018. Keeping the transmission fluid cool is the greatest way to prolong the life of the transmission as heat is a transmission's worst enemy.
    view full answer...
  • Transmission Cooler Recommendation for a 1998 Chevy 1500 Truck with 5.7 Liter Engine
    Transmission coolers are pretty universal in the vehicles they can fit. The part # D13504 would be an excellent choice for your 1998 Chevy Silverado 5.7 liter. I attached an install video that shows it being installed in a similar larger GM SUV. You would also want the fitting part # D13018 so that you don't have to cut any metal lines.
    view full answer...
  • How Many Adapters Is Needed to Install Transmission Cooler in 1997 Chevy K1500
    The Derale cooler part # D13503 is a great choice for your 1997 Chevy K1500. You would only need one of the part # D13018 fitting adapter as it comes with two sides. One to use on the radiator to get the line to the transmission cooler and then the other one to attach back to the disconnected transmission cooler line that was removed. If oil filter clearance is already pretty tight I wouldn't recommend an oil cooler as they take up a bit of space that it sounds like you don't have. Is...
    view full answer...
  • Transmission Cooler Recommendation for a 2003 Chevy 1500 with a 5.3 Liter Engine
    The Derale Dyno-Cool Tube-Fin Transmission Cooler Kit # D12904 that you referenced would be a good choice for you 2003 Chevy Silverado as long as you have the necessary clearance in front of your radiator and AC condenser. This product measures 15-1/4 inches Wide x 10 inches tall x 3/4 deep. Transmission coolers are not too hard to install. I have installed a couple of them and they were not too bad at all. You may also be interested in purchasing Derale GM Radiator Adapters # D13018 so...
    view full answer...
  • Are Radiator Adapter Fittings Needed When Installing Transmission Cooler on 1999 Chevrolet Corvette
    When installing a transmission cooler in a 1999 Chevrolet Corvette the adapter fittings you might need is the Derale Radiator Adapter Fittings for GM, part # D13018. These fittings are only needed if your Corvette has a 5/8 inch hex size fitting on the transmission line. If you have a different hex size, then you do not need the adapter fittings. The # D13018 adapter part is two fittings, which is all you will need to install a transmission cooler to your Corvette. The Derale Snap-In...
    view full answer...
  • What Adapters Are Needed To Install Transmission Cooler on 2009 GMC Sierra
    For installation of a transmission cooler on your 2009 GMC Sierra with the 4.3L V6 engine you will use the Derale Radiator Adapter, part # D13018. If you have the V8 engine ( 4.8L, 5.3L, or 6.0L) you will use the Derale Radiator Adapter, part # D13035. I have posted a photo to show the typical transmission cooler installation. For your Sierra you will use the correct Derale Radiator Adapter Fittings (# D13018, or # D13035) for the engine you have, then install the adapter in the radiator...
    view full answer...
    Image 1 for
  • How to Remove the Snap-In Radiator Fitting for a Transmission Cooler on a 2000 Chevy Express Van
    You will need to get a small pick and pull the o-ring out to be able to remove the snap-in fitting. An auto parts store should be able to get you a replacement o-ring. You could also use the special fittings for a 200 Chevy Express Van, # D13018, so you do not have to cut and flare lines.
    view full answer...
  • Transmission Cooler Recommendation for a 2003 Cadillac CTS
    When it comes to picking out a transmission cooler for a vehicle there is not a list of confirmed coolers that will fit different vehicles. The best way to pick one out is to measure the area in front of your radiator and pick a cooler that will fit in that area. If you have the room I think a Derale Series 8000 Plate-Fin Transmission Cooler Kit # D13502 should work well to cool the transmission fluid of your 2003 Cadillac CTS. The measurements of this cooler are 11 inches wide, 7-1/4...
    view full answer...
  • WhichTransmission Cooler Fittings for a 2007 GMC Truck
    I spoke with my contact at the manufacturer and he said that there are 3 main types of fittings that GM used during that year and that it was more or less random for the GM trucks so you may need any one of the three types. The three types are the fittings that were used are the fitting supplied with the cooler, a snap in style fitting, item # D13035, and the Derale Radiator Adapter Fittings for GM, item # D13018. I believe the last style of fitting is the fitting your truck will need....
    view full answer...
  • How Many Derale Radiator Adapter Fittings Are Needed To Install Transmission Cooler 1999 GMC Yukon
    The item you selected, Derale Radiator Adapter Fitting, part # D13018, is the adapter fitting needed for a transmission cooler for your 1999 GMC Yukon. Part # D13018 comes with a quantity of 2 which you will need to install a transmission cooler on your vehicle. A transmission cooler I would recommend for your vehicle is the Derale Transmission Cooler, part # D13504. The ideal place to mount a transmission cooler is behind the grill, but in front of the radiator or AC condenser as it will...
    view full answer...
  • Transmission Cooler Recommendation and Install Instructions for a 1996 Chevy Express Van
    I would recommend the largest cooler that will easily fit in front of the air conditioning condenser on your 1996 Chevy Express Van. In your case the Derale Class IV, Series 8000 Plate-Fin Transmission Cooler Kit, item # D13504, would be the one that I would go with, but you will need to measure to be sure there is room for it to install in front of the A/C condenser. There is a simple way to determine which transmission line is the return line. Start the vehicle and let it run for a...
    view full answer...
    Image 1 for
  • Derale D13504 Transmission Cooler Installation on a 1993 Chevy G-30 Van
    There are not specific installation instructions when it comes to installing transmission coolers, but there are basic guidelines for installing one that are pretty universal. The first step for installing this Derale Series 8000 Plate-Fin Transmission Cooler Kit, part # D13504, on your 1993 Chevy G-30 van with A/C is finding the best location for mounting the cooler. If you mount the cooler in front of the radiator, you will get the most cooling efficiency from the cooler, whereas it...
    view full answer...
  • Derale Transmission Cooler # D13105 Recommendation for a 2007 GMC Sierra With a 4.8 Liter V8
    This Derale Series 7000 Tube-Fin Transmission Cooler Kit, part # D13105, measures 16-5/8 inches wide by 12-5/8 inches tall and 3/4 inches thick. You will need to do some measuring in front of the radiator that is in your 2007 GMC Sierra. If you find that you have enough clearance there to install the # D13105 cooler, then it would work well for you. You will also want to purchase a Derale Radiator Adapter Fittings for GM, part # D13018, so you will not have to cut or flare any lines to...
    view full answer...
  • How Would a Derale Transmission Cooler # D13504 Install onto a 2001 Chevy Silverado 1500
    The optimum mounting location for a Derale Transmission Coolers, part # D13504, on your 2001 Chevy Silverado 1500 with a 5.3 liter engine would be in front of your radiator and AC condenser as you would get the most airflow to the cooler there. I attached an FAQ article on transmission coolers for you that you should find informative also. When you mount the # D13504 you will use the included Insta-dapt radiator adapters that will get passed through the fins of the # D13504 and then will...
    view full answer...
    Image 1 for
  • Largest Transmission Cooler for a 2004 GMC Savana 3500 Van Using Existing Cooler Lines
    The largest transmission cooler we have for your 2004 GMC Savana Van is the Derale Series 7000 # D13105 which measures 16-5/8 inch wide x 12-5/8 inch tall x 3/4 inch deep, you will also need the Derale Adapter Fitting # D13018 that you referenced for this installation. You will need to measure the area in your engine to determine your available space for a transmission cooler, although the Derale # D13105 is the largest, you will need to check your vehicle to verify the fit. My technical...
    view full answer...
  • Transmission Cooler Recommendation for a 2006 Chevy 2500HD 4L80E Transmission
    Good call trying to reduce your transmission fluid temperatures. The cooler the fluid is the longer the transmission will last. The best way to pick out the best cooler for a vehicle is to measure the area in front of the radiator/ac condenser and select the largest cooler to fit there. It also helps to get a stacked plate style cooler as they are the most efficient and pretty small in size. I attached a link to a page that has all of the stacked plate coolers we offer. I also attached...
    view full answer...
  • Transmission Cooler Recommendation for a 1998 Chevy K1500 Series Truck
    Factory transmission coolers are adequate at best at keeping the transmission fluid within the optimum 160 to 200 degrees F range. Adding a supplemental cooler is a good idea, especially since transmission fluid cannot be over cooled. If you do towing, hauling, or are otherwise looking to get the most life out of your transmission then adding a supplemental cooler would be a great idea. Cooler # D13504 is a good choice. To avoid having to cut and flare lines I recommend adding hose fitting...
    view full answer...
  • Need Threaded Radiator Adapter to Install Transmission Cooler Lines on 2000 GMC Sierra 5.3 Engine
    We offer radiator adapter fittings for the 2000 GMC Sierra to allow installation of a transmission cooler without having to cut and flare lines. Derale part # D13018 is a set of two 5/8-inch inverted flare fittings, one male and one female. If you do not already have a transmission cooler you can choose the largest size that will fit in the space available for mounting; coolers are not actually vehicle-specific. The linked article provides a lot of useful information about types of coolers...
    view full answer...
  • Preventing Leaks When Installing Derale # 15718 Engine Oil Filter Relocation Kit
    I spoke with my contact at Derale and they provided some very useful information. They said you do not want to use a liquid sealant of any type because it acts as a lubricant when first applied and would actually allow you to over tighten the fittings causing leaks. They suggest using a thread tape and tightening to approximately 8 to 10 ft lbs. Although the suggestion to hand tighten and then turn an additional 1/4 turn may work, the term hand tighten would be different for everyone.
    view full answer...
  • Transmission Cooler Recommendation for a 2007 Chevy Silverado, 4.3L, V6
    The most popular transmission cooler for a 2007 Chevy Silverado (New or Classic) with the 4.3 liter is cooler # D13503. This cooler measures 11 inches wide, 8-3/4 inches tall, and 7/8 inches deep. It is rated as a Class III which is what is recommended for vehicles with Class III trailer hitches. Metal lines are not an option but you could replace the rubber hose with metal lines obtained locally. However metal dissipates heat more quickly and easily than rubber so it might end up working...
    view full answer...

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