Derale Series 9000 Plate-Fin Transmission Cooler w/ NPT Inlets - Class IV

Part Number: D33603

$114.58

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derale transmission coolers plate-fin cooler standard mount series 9000 w/ npt inlets - class iv

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Review of Derale Transmission Coolers - Plate-Fin Cooler - D33603

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9-7/8" Wide x 8-1/2" tall x 1-1/4" deep, radiator-style heat exchanger improves the performance and overall functioning of your vehicle's transmission. Includes hose-barb adapters to fit the 1/2" FPT inlets. Great Prices for the best transmission coolers from Derale. Derale Series 9000 Plate-Fin Transmission Cooler w/ NPT Inlets - Class IV part number D33603 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.

Derale Transmission Coolers - D33603

Features:

Prolongs life of transmission
Improves overall performance
Prevents heat-related failures
Has furnace-brazed aluminum construction and 1-1/4" wide turbulator plates for more efficient cooling
Recommended for full-size trucks and SUVs

Specs:

Inlets: 1/2" FPT
Fittings: 1/2" FPT x 3/8" hose barb
GVW: 22,000
Overall dimensions: 9-7/8" wide x 8-1/2" tall x 1-1/4" deep
Distance between inlets: 8-7/8"
Mounting dimensions: 6-3/4" wide x 7-3/4" tall
1-Year warranty

One of the more popular cooling systems available, the radiator-style, plate-and-fin heat exchanger provides increased surface area so that fluids can spread out along the finned chambers to cool faster. In addition to the increased surface area, this cooler also features turbulator technology, whereby fluids are agitated continuously, not only to facilitate heat transfer, but also to prevent any undesirable drop in pressure.

33603 Derale Series 9000 Plate and Fin Heat Exchanger

Video of Derale Series 9000 Plate-Fin Transmission Cooler w/ NPT Inlets - Class IV

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

Video Demo Derale Transmission Coolers Plate Fin Cooler D33603

Review of Derale Transmission Coolers - Plate-Fin Cooler - D33603

Video Transcript for Review of Derale Transmission Coolers - Plate-Fin Cooler - D33603

Hello everybody, this is Jeff at etrailer.com. Today we're gonna take a look at this Derale Series 9,000 plate and fin transmission cooler with the FPT inlets. Now the vast majority of automatic transmission failures are a direct result of overheating, and towing can place an extra strain on the transmission, causing it to get hot. An aftermarket transmission cooler like this one can help prevent overheating and extend the life of your vehicle's transmission. Even if you're not towing, it still can keep your transmission cooler, which can be beneficial. Even a relatively small drop in fluid temperature can almost double the transmission's life and increase its performance.

And most of the factory cooling systems are adequate at best 'cause they'll rarely maintain your transmissions fluid within the ideal operating range of 160 to 200 degrees. So adding this transmission cooler, it's not difficult and it extends the life of your vehicle and ensures that it functions at its best. Now, one of the more popular cooling systems is this radiator-style plate and fin heat exchanger. This will provide increased surface area so that the fluids can spread out along the fin chambers to cool faster. This unit is perfect for light to medium duty use in occasional towing, and it is recommended for full size trucks and SUVs.

As we mentioned, it'll greatly extend the transmission life by preventing heat-related transmission failures and it improves the shifting performance. Now, in addition to the increased surface area, this cooler also features turbulator technology where the fluids are agitated continuously, not only to facilitate heat transfer, but also to prevent any undesirable drop in the pressure. Has the furnace raised aluminum construction. 1 1/4 inch wide turbulator plates for more efficient cooling. And the specs on this, the inlets right here at the top.

The inlet size is a half inch FPT. The distance between those inlets, if we put a ruler on it, center to center, 8.5 inches. Now the overall dimensions on this, if we measure the width from this side to this side, you're gonna be right at 9 7/8 inches wide. The height, including the mounting tabs, from the bottom all the way up to here, is 8.5 inches tall. We mentioned the depth.

It's gonna be right at 1 1/4 inches deep. And the mounting dimensions, which where these mounting tabs are, you'll see the two holes and two holes at the bottom. The horizontal center to center measurement on the mounting dimensions, and we right at 6 3/4 inches. And center to center for the vertical, 7 3/4 inches tall. But that should do it for a look at this Derale Series 9,000 plate and fin transmission cooler with the FPT inlets.

4.6

96 reviews

5 Stars		(73)
4 Stars		(18)
3 Stars		(2)
2 Stars		(0)
1 Star		(3)

by: Duane 03/25/2026 One Year Later

I pulled a tab 320 camper from WI to AZ with a RAV4 Toyota and back again!! Tranny cooler definitely made it a doable drive!! Thanks again !!

Gwendolyn Y.

4/9/2026

That sounds like an awesome trip! Do you have any long trips planned for this year?

by: P71toZ71 03/31/2016 One Year Later

My vehicle originally did not have a transmission cooler. After warming up, my transmission temperature would typically be 100 degrees higher than the ambient air temperature, whether moving or stopped. Towing the largest enclosed U-Haul trailer (6'x12') would raise the temperature to about 120 degrees above ambient.

After adding this cooler, the transmission stays about 70 degrees higher than the ambient air temperature on the highway, and 80-85 degrees above ambient while parked or driving in slow traffic. I haven't towed that same U-Haul trailer since adding the cooler, but towing a much larger (8.5'x20') enclosed trailer raises the temperature to about 110 degrees above ambient.

If you can find a spot the cooler will physically fit, it should work for your vehicle. You may have to get creative to solidly mount it. I used an angle grinder to remove part of a factory brace. When doing work in this area of your vehicle, be careful not to puncture the AC condenser! If you do, like I did, you will have to replace it. Some AutoZone locations will rent a vacuum pump and manifold gauge set. Doing your own repair means the total repair cost is only the sum of the new AC condenser and refrigerant.

The inlet/outlet NPT fittings on this cooler need to be tighter than you think. I was worried about stripping the threads, and didn't tighten them enough at first. I ended up removing my bumper cover multiple times to tighten them until they stopped leaking. I found the best way to detect a leak was to zip-tie a folded paper towel below the fitting. If it turned red, there was a leak. For my application, I would have preferred built-in 3/8" hose barb inlets instead of the 1/2" NPT fittings.

Click to Enlarge

by: Chris 03/18/2026

You only get a few feet of hose. I don't understand how you're supposed to hook into your transmission line with such small amount of hose. I had to purchase 9 ft from the logo auto parts store. That was only the beginning. The clamps are very cheap. Two of them broke while tightening them. I had to stop again and run to the hardware store for clamps. The whole ordeal was very frustrating. Do yourself a favor and skip the so-called kit.

by: Ben 04/30/2021 One Year Later

Easy to install and has worked great on my '06 4Runner v6. A little extra piece of mind for the mountains. This size just barely fits on the passenger side of the radiator - there is a central, vertical support bar behind the grill that prevents a wider cooler from fitting.

Click to Enlarge

by: Mark 07/28/2025 One Year Later

The cooler works great and fits good. I installed it on the bumper brace on our 2017 GMC Acadia. I dropped a star simply because it didn't come with the fitting the snap ring style line necessary to installing it on a newer GM vehicle.

by: Ben L 10/01/2014

2006 GMC 1500
This product is solidly designed and the installation kit well thought out. The connection hose was heavier and better quality than what the auto parts store could provide. I will be adding additional clamps to the connections so there are two on each just as a precaution against leakage. The single clamps are working well for my test period. I fabricated brackets for mine but using the plastic pins would work just as well. It is a huge improvement over the factory cooler. I would recommend it to anyone that is towing near or at truck capacity.

Ben L. One Year Later

10/29/2015

The cooler is working flawlessly. I replaced the clamps with 12 PEX pipe crimps for a better seal. The transmission has operated within safe temps while towing 7000 lbs on I-70 over the Rocky Mountains. It is a worthy product!

by: Steve B. 05/27/2020 One Year Later

This Transmission cooler really works well. It keeps my transmission much cooler while towing heavy trailers. I connected it in series with the factory coolers for a lower operating temperature. If towing or hauling heavy loads I recommend this plate cooler. Also plates remove more heat than tubes.

Steve B. One Year Later

5/28/2021

This cooler is great. The transmission even towing rarely ever gets above 150 degrees. Heat is the main cause of transmission failure and fluid turning to varnish. Highly recommend this cooler.

by: Orville 01/18/2023 One Year Later

I had this installed and after 1 month it started to leak from the fins. I ordered another, had it installed and it has worked with no problems. etrailer took the defective cooler back no problem and gave me a full refund. Excellent customer service

Orville One Year Later

1/19/2024

One year in and I’ve had no problems. No leaks and it still seems to be working fine.

by: lopez 07/30/2014

i recived my Derale Series 9000 Plate-Fin Transmission Cooler Kit w/ NPT Inlets - Class I -Extra Efficient - D13611 and i really like it its well built and it look to be heavy duty and am looking forward to installing it.thanks again for a great item.

Lopez One Year Later

7/30/2015

Its excellent inproved the performance of my truck 100 I am a very satisfy customer.

by: Robert 05/21/2019

Packaging was damaged but no damage to cooler due to solid construction. Had done online searches for installation tips and suggestions. All very beneficial. However, this cooler is larger than many I saw online and I had to find an alternate installation location. I was able to find a suitable location in front of radiator and minor modification (drilled two additional mounting holes in mount bracket and trimmed one corner for clearance.) Overall has shown lower transmission operating temps. Have not towed since installation and hope that lower temps carry over to towing a load. I give this product,shipping, and customer service a thumbs up.

by: John B 08/23/2016

Kit had almost everything needed to install on my 09 Subaru Forester. The only extra thing I bought was another four foot length of hose.

I made brackets out of metal I had on hand for a more secure mounting, and I installed the cooler with the ports facing the drivers side. I wanted to avoid sharp bends in the hoses so I made loops in both hoses to connect to the existing lines in my car. I also slid pieces of old garden hose over the new hoses at points where it was close to metal parts to avoid chafing of the hoses. The hose supplied with the kit was the correct diameter for my car and the hoses slid onto the existing fittings.

I took my time with the install. I had to move the horn so I could position the cooler on the drivers side in front of the radiator and AC condenser. Routing of the hoses to the existing connections required some planning (and an extra hose) but everything else is very simple.

Very nice kit!

by: 7502yuma 01/11/2017 One Year Later

I have been happy with the Derale transmission cooler. Installation was simple enough and one year later it is still working fine

7502yuma One Year Later

1/14/2018

I actually have been very pleased with the performance. That was my third installation and all of them are working great . Thanks for asking.

by: Steven 07/12/2019

The cooler was easy to install,the instruction were easy to follow. I did check the oil temp after pulling a 4000 ft grade pulling a camp trailer with an electronic temp probe and there was a 50 deg temp drop thru the cooler.

Steven One Year Later

7/14/2020

worked as described

by: Jerry R 02/28/2012

and took about 2 hours from start to finish. Installation was simple and was able to mount on the A frame in front of the radiator. Installation instructions was clear and was helpful with determine the supply and return lines. Fittings matched up perfect with no need to change out. I had to purchase another 4' of hose but the cooler was a lot simpler to install than I had expected.

by: Orville 05/26/2023 One Year Later

The first cooler leaked within 1 month of installation but I returned it for a full refund, got another, and the second one has worked perfectly for the last year. etrailer has customer service second to none!

by: Dennis H 05/03/2015

Kind of an easy install on a 2011 Chevy Traverse LS. Fast shipping. Taking a long trip in a couple weeks towing a 3500 lb travel trailer. We'll see how it goes.
Thanks for all of the products etrailer has supplied to make my LS tow ready!

by: James 08/21/2023 One Year Later

The product is great, the only issue I had was that it did not have the correct connectors for the Jeep Wrangler, but I was able to get some quickly. It's kept my Jeep's Trans fluid temp nice and cool, even when pulling my 3k pound travel trailer.. GREAT!

by: Earle 09/10/2022

This oil cooler has really helped improve the oil pressure in my GEN III Hemi by reducing the oil temperate approximately 20 degrees cooler than before we installed it. Excellent product by Derale and service by etrailer.com.

by: John 06/11/2021 One Year Later

Pretty easy to install. Worked great. Prior to adding this transmission cooler my transmission temps would routinely go over 200F so before I installed the cooler I had my transmission serviced. Thankfully no issues or burnt ATF. After installation the temps never went over 190F even towing in the south Louisiana heat. Great product and I'd buy again if needed.

by: Aux Transmission Kit 02/13/2017 One Year Later

This aux transmission kit was easy to install and did just the trick in bringing my engine and trans temps down form towing my trailer. Definitely recommend!

by: John 08/18/2021 One Year Later

Installed it on a 99 Ford F250 with a diesel, that was having transmission overheating problem when towing a trailer. Fixed the problem.

by: John 11/09/2021 One Year Later

Works great to cool the air going into my Air Compressor tank.

by: Alex 07/12/2021

Parts arrived fast and in good condition. My setup needs recessed mounting, and I must use the cooler's bolt holes for proper clearence and support. Supplied plastic ties and foam are not quite enough for a secure mounting, and the supplied hose barb fittings are nice aluminum, but I need a 1/2" barb end, not 3/8". These little things are no problem. I'm happy and will buy from e-trailer again.

by: John C. 11/18/2014

My original transmission cooler sprung a leak on my 1990 dodge pickup and a direct replacement couldn't be found. Etrailer had a cooler that would fit and do the job. Would highly recommend them to solve your problems and supply what's needed.

by: Reinhart 10/13/2025

worked well .

true

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Info for this part was:

Installed by:

Jeff D

Installed by:

David F

Video by:

Dustin K

Updated by:

Wilson B

Updated by:

Jessie B

Written by:

Ronnie R

Edited by:

Daron K

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