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  1. Transmission Coolers
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  4. With 1/4 Inch NPT
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  6. 20-1/4L x 2-3/16W x 3-1/4T Inch
Derale 20" Dual-Pass Heat Sink Transmission Cooler with Installation Kit

Derale 20" Dual-Pass Heat Sink Transmission Cooler with Installation Kit

Item # D13265
Retail:$138.42
Our Price: $90.99
You Save: 34%
Transmission Coolers
Shipping Weight: 3 lbs
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Derale Transmission Coolers - D13265
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20-1/4" Long x 2-3/16" wide x 3-1/4" tall, heat-dissipating kit improves the performance and overall functioning of your vehicle's transmission. Compact design allows cooler to be mounted on nearly any frame rail. Great Prices for the best transmission coolers from Derale. Derale 20" Dual-Pass Heat Sink Transmission Cooler with Installation Kit part number D13265 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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Derale Transmission Coolers - D13265

  • Frame Rail Cooler
  • With 1/4 Inch NPT
  • Frame Mount
  • 20-1/4L x 2-3/16W x 3-1/4T Inch
  • Derale
  • Dual-Pass

20-1/4" Long x 2-3/16" wide x 3-1/4" tall, heat-dissipating kit improves the performance and overall functioning of your vehicle's transmission. Compact design allows cooler to be mounted on nearly any frame rail.


Features:

  • Extends life and improves functioning of transmission
  • Absorbs and then dissipates heat effectively through both internal and external aluminum fins
  • Has a compact, 3" diameter housing, capable of fitting most frame rails
  • Designed with inlet and outlet on same end so that tube can be routed through cooler, taking up less space in the engine compartment
  • Includes rubber hose with stainless steel clamps, adapter fittings and all necessary mounting hardware


Specs:

  • Inlets: 1/4" NPT
  • Overall dimensions: 20-1/4" long x 2-3/16" wide x 3-1/4" tall
  • Mounting dimensions: 19-5/8" long x 1-3/8" wide
  • 1-Year warranty


Dimensions

13265 Derale Dual Pass Aluminum Heatsink with Installation Kit for Transmission

Installation Details D13265 Installation instructions



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See what our Experts say about this Derale Transmission Coolers

  • Will A Transmission Cooler Reduce Airflow To My Radiator?
    Placing an aftermarket cooler such as the Derale Series 8000 Plate-Fin Transmission Cooler part # D13503 in front of your radiator or A/C condenser will minimize the effectiveness of both units however, the amount to which the aftermarket cooler will decrease the functionality of these units is very minimal. Air will still pass through the aftermarket cooler and reach the condenser and radiator thus allowing for an effective operating temperature. In fact, the recommended location to install...
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  • What is Correct Placement of Derale Dual-Pass Heat Sink Transmission Cooler # D13265
    Maximum air flow will increase the heat exchange performance of any oil or transmission fluid cooler. This is true for flat plate-fin and tube-fin type coolers that typically mount in front of the air conditioning condenser as well as for heat-sink-type coolers intended for mounting on the frame rail. If mounted in a location that does not provide maximum air flow the cooler will still help to reduce the fluid temperature to some extent but it will not function at its best. If you prefer...
    view full answer...
  • Oil and Transmission Coolers for 1993 Dodge with 250 Cummins Diesel Operated in Desert Climate
    Since oil and transmission coolers come in a range of sizes and types, and can mount in any location that will provide air flow (or in the case of fan-powered units enough space for convenient mounting) you can install both a secondary transmission cooler and a fan-powered oil cooler. I recommend using a secondary transmission cooler in addition to the OEM unit rather than bypassing it. The secondary cooler will take the already-cooled transmission fluid from the radiator and further...
    view full answer...
  • Engine Oil and Transmission Fluid Combination Cooer for a 2006 Chevy Avalanche
    for a remote combination oil and transmission fluid cooler I recommend # D15230. You will also need installation kit # D13006 and oil cooler kit # D15752. This is a thermostatic oil cooler kit so the thermostat will be associated with the engine oil temperature and it will activate once the temperature reaches 180 degrees so it will be perfect for your application. To make installation of the transmission cooler part I recommend adding fitting # D13035 for the 5.3 liter motor or # D13018...
    view full answer...
  • Determining Transmission Return Line for Transmission Cooler Install
    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 is not...
    view full answer...
  • Recommended Frame Rail Transmission Cooler for 2005 Dodge Ram
    The Derale 20" Dual-Pass Heat Sink Transmission Cooler # D13265 you asked about is not the largest. The largest frame rail cooler we have is the Derale 26" Heat Sink Dual-Pass Transmission Cooler # D13266 which is 26-1/4" long x 2-3/16" wide x 3-1/4" tall. We also have a single pass # D13256 with these same dimensions. The dual-pass will provide more cooling. Although it is technically possible to cool the transmission fluid too much, that would only ever be an issue in extremely cold...
    view full answer...
  • Transmission Cooler Recommendation for a Hot Rod with a 454 BBC and Turbo 400 Transmission
    A lot depends on how much power you plan on producing with that big block and how big of a stall you are planning on using. Some stock 454's aren't crazy powerful, whereas others like the LS6 are very powerful. With that being said I would go with the absolute biggest cooler you can fit. Also, stacked plate coolers are the most efficient style so I would lean towards one of those as well. For example, the stacked plate cooler part # D13403 would do an excellent job for you so I would recommend...
    view full answer...
  • Can Derale Transmission Cooler Replace Factory Transmission Cooler
    It's pretty common that people will bypass their factory transmission cooler altogether with an aftermarket transmission cooler. Ideally you run both to maximize cooling power but sometimes the factory cooler is damaged and it's just easier to bypass it. We recommend going with as big of a cooler you can fit like the Derale # D13504 which measures 11" Wide x 12" tall x 7/8" deep and is the very efficient plate-fin style of cooler.
    view full answer...
  • Can Heat Sink Cooler be Added to Vehicle That Already Has Two Coolers
    While you can technically install the Derale 20" Dual-Pass Heat Sink Transmission Cooler # D13265 in your vehicle that already has an Atomic-Cool Remote Transmission Cooler like # D13950 and another aftermarket oil cooler, it is not recommended. Additionally, there should not be a need for additional cooling considering what you already have; if your transmission temperatures are still too high it may be a good idea to have the transmission loooked at.
    view full answer...
  • Should Factory Cooler of Vehicle Be Used With a Supplemental Transmission Cooler or Bypass It
    The ideal setup is to have the fluid go first through the cooler that is mounted in the radiator of the vehicle and then to a supplemental cooler like the part # D13265. Some people will use coolers like this as a standalone but if your factory cooler is working well I would recommend continuing to use it along with the # D13265.
    view full answer...

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 Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R

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