Derale Transmission Coolers for your 1999 GMC Sierra are available from etrailer.com. Installation instructions and reviews for your GMC Transmission Coolers. Expert service, and cheapest Transmission Coolers price guarantee. etrailer.com carries a complete line of Derale products. Order your Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class III - Economy part number D12903 online at etrailer.com or call 800-298-8924 for expert service.
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Transmission Cooler > 1999 > GMC > Sierra

Derale Transmission Coolers for the 1999 GMC Sierra

Derale Transmission Coolers

(50 reviews)


Code:   D12903

Retail:$64.42

Price:$38.95


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Shipping Weight: 2.25 pounds

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Derale Dyno-Cool Tube-Fin Transmission Cooler Kit - Class III - Economy - 1999 GMC Sierra

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 GMC Sierra'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 GMC Sierras 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






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Customer Reviews

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

Average Customer Rating:  4.6 out of 5 stars   (50 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: Jeff F06/29/2011


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




- D12903

by: Scott06/27/2014


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






- D12902

by: Michael L04/30/2015

Review from a similar Derale Dyno-Cool in Transmission Coolers


good product form a great company ! my only complaint is this was listed as for my specific truck, but the "insta-dapt" supplied doesn't fit the Dodge truck of my year. even doing my research ahead of time, it seems to be hit or miss whether it would fit as some of them come with 5/16 fittings and some (like mine) come with 9/16 fittings. it doesnt matter the engine size, even other 3.7L dodge trucks of the same year have 5/16 fittings... I think Dodge made a change middle year, but never let the consumer know as mine is a late year '04. no dig deal as I was able to assemble it anyways and got it up and running great and both the radiator and trans are running much cooler now ! I attached the D12902 to the bumper as you will see in attached images. 2 attached images are just before finishing, bumper hasnt been attached yet, one of them is after everything was complete. 189096



- D12906

by: Dustin C02/03/2012

Review from a similar Derale 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: Dan L04/08/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


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. 124351


Comments

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.

Dan L - 04/10/2015

10734



- D12906

by: Dave C12/10/2012

Review from a similar Derale Dyno-Cool in Transmission Coolers


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. 61081



- D12906

by: Ron05/13/2014

Review from a similar Derale 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



- D18910

by: DT11/20/2013

Review from a similar Derale Dyno-Cool in Transmission Coolers


etrailer is always nice to deal with. Good service & good pricing. I received this order in a timely manner. My concern was noise / sound level. This fan moves a lot of air and is incredibly quiet. This is going to cool a generator enclosure box in my RV (air cooled generator) and the project is to replace a noisy standard generator with a new one, so noise reduction is key and this is the right fan for me. Don't hesitate to pick this one if quiet is a priority for you too. 107896



- D16908

by: DALE04/22/2013

Review from a similar Derale Dyno-Cool in Transmission Coolers


This fan is for a project that will not be completed until the middle of 2014 or later. I plan to use it to increase the air flow through the air conditioner condenser in my 1969 Corvair convertible. I will be ordering another fan since my design requires two fans for greatest efficiency and the flow rate for these fans is on the low side. The 500 cfm fans comes with too many items that are useless for my application thereby being too expensive. Dale Bartley 77284



- D12906

by: Lee I.06/05/2014

Review from a similar Derale 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



- D12901

by: John S.05/19/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


I installed this cooler on a 2001 odyessey to help prevent a future trans failure.It was delivered quickly when promised,came with everything I needed for installation and had no problems.Overall a good product I would recommend this to anyone. I am also very happy with etrailer.coms service and selection and would definitly use them again. 14807



- D12906

by: Jeremy Troesh06/21/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


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. 17556



- D12904

by: Donald01/30/2013

Review from a similar Derale Dyno-Cool in Transmission Coolers


Easy install. But hoses need to be longer. I had to go to napa to purchase an extra 3 ft. The hose clamps that were included were limited to the amount of tension that were put on them. They would tighten to x amount then just spin. I had to purchase extra hose clamps that actually tightened. Impressed overall. 64593



- D18910

by: chris p02/20/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


This is the second fan I have bought from etrailer and there service and follow up has been excellent and so have the products they arrive in perfect shape and on time this is the best place to get a electric fan 117084



- D12906

by: Martin K.06/05/2015

Review from a similar Derale Dyno-Cool in Transmission Coolers


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. 200849



- D12906

by: Don T.05/05/2015

Review from a similar Derale Dyno-Cool in Transmission Coolers


Have not installed yet but the product looks great. Etrailer.com'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. 190548



- D12906

by: Robin S.10/10/2013

Review from a similar Derale Dyno-Cool in Transmission Coolers


This is a great product and it is priced better than anywhere else that I could find. The shipping was extremely fast and the product was packaged well - I know it will help in my towing on my Tahoe 103267



- D12904

by: Dylan07/18/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


Very fast shipping. Everything was there and in pretty decent condition. Would have been perfect, but some fins were bent, though it could have been the delivery company. Definitely recommend 19614



- D12901

by: Alan Raybourn08/07/2012

Review from a similar Derale Dyno-Cool in Transmission Coolers


I received the trans cooler yesterday afternoon and installed it on my 1996 chevrolet astro this morning in less than an hour, now I can pull my travel trailer with my van. 50838



- D12213

by: Jeff B.05/24/2015

Review from a similar Derale Dyno-Cool in Transmission Coolers


Everything seemed good with this kit. They aren't kidding about the tight hoses- they are tough to get much past the barb...but they do have to be tight to stay leak-less. 196418



- D12906

by: Ruel D.11/04/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


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! 159240



- D16908

by: lee maino11/04/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


Great staff great products grade A service from customer service will definitely order from etrailer again 26560


Comments

Hi I need to know at what temp. is exactly activated Thanks

comment by: LIVIU - 08/09/2013


1868

This fan does not include a thermostat system. It can be wired into the original electrical system and will then operate according to the thermostat system in the vehicle. It can also be wired to an on/off switch but that is usually only done if off-road and race applications. We have plenty of thermostat options, sold separately, for determining the temperature at which the fan kicks on. For example, part D16735 kicks on at 180 degrees and shuts off at 165 degrees. Part D16759 is an adjustable thermostat system. Turn-on temperate can be set any where between 150 and 240 degrees. The turn-off temperature will always be 10 degrees less than the turn-on temperature.

Patrick B - 8/9/2013




- D12901

by: Bob Z06/12/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


This is an excellent price and appears to have more cooling capacity over the OEM cooler. Installed very easily. This was used on an 08 HONDA PILOT 135385



- D18910

by: Mark05/10/2013

Review from a similar Derale Dyno-Cool in Transmission Coolers


Tested fan after reversing blade, moves air well, also have to reverse wires when installing if pusher is what you want. Not a flimsy fan. Fast shipping. 79742



- D12901

by: Donald Catoe12/11/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


The product was just what I needed. The description was accurate, the price was great and the shipping was fast. Thanks Donnie 164228



- D12906

by: wv hiker06/12/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


Installed on a 2002 chevy tracker with ease. very well made and all parts provided were well thought out for the installation. 135278



- D12906

by: Allan11/10/2012

Review from a similar Derale Dyno-Cool in Transmission Coolers


Got my Tranny Cooler and basically did what they showed on the on line video and had it completted in one afternoon. 59191



- D12213

by: Chris G.10/18/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


I was amazed at how quickly I received the fluid cooler I ordered and how well packaged it was. Good job etrailer. 25739



- D12906

by: Brandon04/18/2012

Review from a similar Derale Dyno-Cool in Transmission Coolers


I installed it in my 2007 Honda Odyssey and it works great. It took about an hour and a half to install. 37669



- D12906

by: ks11/10/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


hose provided could have been a little longer, but overall product was a good fit for our Honda Odyssey 160190



- D12906

by: Kenneth W04/14/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


Easy to follow instructions. You will need to remove the front clip to install. Nothing too difficult. 124916



- D12906

by: Potato Pirate04/14/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


Great for the price. Works well on my Honda Pilot and provides more cooling then the OEM cooler. 11785



- D12213

by: rick10/22/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


great product easy to install - put it in my 66 mustang as a power assist steering cooler 157550



- D12901

by: Andy C.12/05/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


Great service. Part I ordered was as described on the website and was shipped out quickly. 27689



- D12901

by: Oliver S05/01/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


Two cars, two transmissions radiators, very good product from etrailer.com Thank you ! 128472



- D12200

by: John Murdock09/04/2013

Review from a similar Derale Dyno-Cool in Transmission Coolers


Excellent cooler, easy to install. Used on a 2008 JK Rubicon on the power steering. 98206



- D12906

by: Potatopirate05/07/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


Very inexpensive and does the job well with everything I needed included. 13054



- D18910

by: JP04/21/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


prompt delivery of product, easy to attach to radiator, moves air well 126247



- D12906

by: jesus r08/01/2013

Review from a similar Derale Dyno-Cool in Transmission Coolers


Good reliable cooler and really good shipping and tracking! 92799



- D12901

by: Aly07/22/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


This is a great after market to substitute for the original. 19879



- D12904

by: Randy07/19/2015

Review from a similar Derale Dyno-Cool in Transmission Coolers


WOW, My order came fast, I'll be shopping with them again! 212935



- D12200

by: Devin Schultz05/20/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


Have not installed this yet but it looks reel purty 14936



- D12906

by: Dave t.09/23/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


Very good product. easy to install. Thank You 152634



- D12904

by: Victor01/19/2012

Review from a similar Derale Dyno-Cool in Transmission Coolers


Fast shipping, good price!!! Thank you 29941



- D12901

by: jimmy m10/24/2011

Review from a similar Derale Dyno-Cool in Transmission Coolers


quick shipping & grt price 26027



- D12906

by: Danny03/26/2015

Review from a similar Derale Dyno-Cool in Transmission Coolers


top quality,perfect fit! 180949



- D12906

by: Jim R.06/01/2014

Review from a similar Derale Dyno-Cool in Transmission Coolers


Works as described. 133626



- D12906

by: denman12/17/2012

Review from a similar Derale Dyno-Cool in Transmission Coolers


see previous review 61610



- D12906

by: Dave08/18/2012

Review from a similar Derale Dyno-Cool in Transmission Coolers


Good Product 52237



- D12907

by: Kevin K.08/09/2012

Review from a similar Derale Dyno-Cool in Transmission Coolers


Nice 51072

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Ask the Experts about this Derale Transmission Coolers
Do you have a question about this Transmission Cooler?


  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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...

  • 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 you have a question about this Transmission Cooler?



Info for this part was:


Photos by:
Theodore B

Updated by:
DeAnne T

Expert Research:
Patrick B

Expert Research:
Michael H

Expert Research:
Adam R

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