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  1. Transmission Coolers
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  3. Plate-Fin Cooler
  4. Heavy-Duty Truck
  5. With 1/2 Inch NPT
  6. Standard Mount
Derale Series 9000 Plate-Fin Transmission Cooler w/ NPT Inlets - Class V

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

Item # D33604
Our Price: $75.79
You Save: 59%
Transmission Coolers
Shipping Weight: 3 lbs
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10-1/8" Wide x 11-7/8" 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" NPT inlets. Great Prices for the best transmission coolers from Derale. Derale Series 9000 Plate-Fin Transmission Cooler w/ NPT Inlets - Class V part number D33604 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (82)
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  • Videos (1)
  • Photos

Derale Transmission Coolers - D33604

  • Plate-Fin Cooler
  • Heavy-Duty Truck
  • With 1/2 Inch NPT
  • Standard Mount
  • 10-1/8W x 11-7/8T x 1-1/4D Inch
  • Derale

10-1/8" Wide x 11-7/8" 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" NPT inlets.


  • 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


  • Inlets: 1/2" NPT
  • Fittings: 1/2" NPT x 3/8" hose barb
  • GVW : 24,000
  • Overall dimensions: 9-3/4" wide x 10-5/8" tall x 1-1/4" deep
  • Distance between inlets: 8-1/2"
  • Mounting dimensions: 6-3/4" wide x 9-7/8" 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.


33604 Derale Series 9000 Plate and Fin Heat Exchanger

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

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

Video Transcript for Review of Derale Transmission Coolers - Plate-Fin Cooler - D33604

Hello everybody, this is Jeff at Today, we're gonna take a look at this to Derale 9000 Series Plate and Fin Transmission Cooler with the NPT inlets. Now, vast majority of automatic transmission failures are a direct result of overheating, and towing can place an extra strain on your transmission causing it to get hot, and an aftermarket transmission cooler can help prevent overheating, and extend the life of your vehicle's transmission, and even if you don't tow, keeping your transmission cooler can be beneficial. Even a relatively small drop in fluid temperature can almost double the transmission's life, and increased its performance. Now, most of the factory cooling systems are adequate at best, rarely maintaining your transmission's fluid within the ideal operating range of about 160 to 200 degrees. So adding a transmission cooler is not difficult, and it can even extend the life of your vehicle, and ensure that it functions at its best.

Now, one of the more popular cooling systems is this radiator style, it's called a plate and fin heat exchanger. This provides increased surface area, so the fluids can spread out along the fin chambers to cool faster. Just wanna zoom in to give you a better look at it. You can see the plates that run horizontally, and then the fence that go up and down to help cool it. Now, this unit is perfect for light to medium duty use and occasional towing.

This is recommended for full size trucks and SUVs. Does have a gross vehicle weight rating of 24,000 pounds, and this will greatly extend the transmission life by preventing heat related transmission failures, improve shifting performance, and it improves overall performance when you're towing. Now, in addition to the increased surface area, this cooler also features a nice turbulator technology where by the fluids are agitated continuously not only to facilitate heat transfer, but also prevent any undesirable dropping pressure. It does use a furnace brace aluminum construction, has a nice black coating on it for protection. Does use 1 1/4 inch wide turbulator plates for more efficient cooling.

A few specs on this, if you look at the top, you can see the two inlets, the inlet size is a half inch NPT size. Few measurements, the distance between those inlets, center to center, is right at 8 1/2 inches. Overall dimensions on this, if we do the overall width, from this side to this side, is gonna be right at about 9 3/4 inches wide. The overall height on it, from very bottom to very top of the mounting plate, is 10 5/8 inches tall. Total depth on the unit is only about 1 1/4 inches deep, and the last thing to give you is the mounting dimensions.

If you notice the back here, there's two holes here, two at the bottom, those are your mounting holes. So horizontally, center to center of the mounting hole, is right at 6 3/4 inches, and the height, center to center on the mounting holes, it's right at 9 7/8 inches. But that should do it for the review on this Derale 9,000 Series Plate and Fin Transmission Cooler with the NPT inlets..

Customer Reviews

Derale Series 9000 Plate-Fin Transmission Cooler w/ NPT Inlets - Class V - D33604

Average Customer Rating:  4.7 out of 5 stars   (82 Customer Reviews)

10-1/8" Wide x 11-7/8" 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" NPT inlets.


Great product, it was as described online, and arrived on time, would definitely purchase again!


This cooler is the largest that will fit a 02/09 Chevy Trail Blazer. Will take half a day and many specific extra parts to install to OEM quality. It cools


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


Exactly as described, looks and feels well made. Mounting and. hookup was straightforward and reasonably simple. Working perfectly so far. Love all the videos of products! This helps so much. Keep up the great job.


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!


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.


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!


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.


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.


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.


I can not install the transmission cooler BECAUSE the other parts ordered has not arrived.


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


Installation was relatively easy- quality product.


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!


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.


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


Installed on a 2005 Chevy Suburban 5.3 V8 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.


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.


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.


Cooler looks to be good but hose clamps were junk and hose was too short. Had to buy clamps and more hose.


Installed I about an hour in my ‘09 Tahoe. Been in for a week now and lowered the tranny temp an average of 15-20 degrees. I definitely needed the extra hose that was suggested in other reviews. I actually, accidentally, ordered 2 extra so or goes on my “overs” shelf. No trailer hauling yet but will be pulling a 8x16, 4000lb about 2 hours on Friday. That’s my real test.


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


Installed on a 2017 Armada and has worked great for this last year.


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!


Quick service and delivery, packed good, no damage. Would buy from again when the need arises.

Installing the D13612 cooler on a Bolens HT20 tractor to help keep the hydraulic/hydrostat temperature down to normal operating range. Not finished yet with the installation.


Show More Reviews

See what our Experts say about this Derale Transmission Coolers

  • Bypassing Factory Transmission Cooler on a 2003 Chevy Trailblazer LT 4.2 I-6
    It is possible to bypass the factory transmission cooler on your 2003 Chevrolet TrailBlazer, but I would not recommend doing this with the Derale Series 8000 Plate-Fin Transmission Cooler # D13503. The cooler is a Class III cooler and as such, it's not quite big or efficient enough to function as a primary cooler. I contacted Derale and they recommend the Derale 9000 Series # D33604. This is a Class V transmission cooler which provides more effective cooling and measures 10-1/8" wide...
    view full answer...
  • Engine Oil Cooler With 3/8 Inch NPT Inlet
    We do have an engine oil cooler with 3/8" NPT inlets, from Derale, at the following part number: - Derale Plate-Fin Engine Oil Cooler Kit w/ Adjustable Sandwich Adapter (Multiple Threads) # D15405 The Derale # D15405 sandwich adapter has 3/8" NPT inlet and outlet ports, 2-3/4" and 3-1/2" O-ring diameters, and fits 3/4"-16, 13/16"-16, 18 mm x 1.5 mm, 20 mm x 1.5 mm and 22 mm x 1.5 mm engine filter threads.
    view full answer...

Do you have a question about this Transmission Cooler?

Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee David F
Installed by:
David F
Employee Dustin K
Video by:
Dustin K
Employee Ronnie R
Written by:
Ronnie R
Employee Daron K
Edited by:
Daron K
Employee Jessie B
Updated by:
Jessie B
Employee Noah M
Updated by:
Noah M

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