Derale Transmission Fluid Cooler For a 2006 GMC Sierra 2500HD With AN Transmission Lines
Updated 06/29/2022 | Published 06/28/2022 >
Products Featured in This Question
Question:
So I have a 2006 GMC 2500HD with the Allison transmission and the 8.1 V8. I am looking at upgrading my existing transmission cooler to a new Derale 51978. I have removed the existing rubber crimped lines and replaced them with braided steel lines and used AN fittings after I flaired the metal lines. Now looking at getting a bigger cooler and removing the lines going to the radiator and run them straight from the transmission to the cooler. I know they say that the radiator is to warm the transmission fluid when it is cold. Is there any problems with doing this?
asked by: Art E
Expert Reply:
To attach the Derale 19-Row, High-Performance, Stacked-Plate Cooler # D51978 you will need to get the correct fittings to match your AN fittings you added to your transmission lines.
Derale -6 AN Aluminum Fitting # D59006
Derale -8 AN Aluminum Fitting # D59008
Derale -10 AN Aluminum Fitting # D59010
Derale -12 AN Aluminum Fitting # D59012
You will be able to run the lines directly to the cooler and remove the lines that go into the radiator. I do recommend using a Edge Insight CS2 Comprehensive Gauge Display # EP84030 to monitor the transmission fluid temperature to ensure you do not overheat your transmission.
Product Page this Question was Asked From
Derale 19-Row, High-Performance, Stacked-Plate Cooler with -10 AN O-Ring Inlets - Class V
- Transmission Coolers
- Stacked-Plate Cooler
- Heavy-Duty Truck
- Standard Mount
- 13W x 6-7/16T x 2D Inch
- With - 10 AN O-Ring
- Derale
more information >
Continue Researching
- Article: Frequently Asked Questions About Transmission Coolers
- Q&A: Larger Trans Cooler Recommendation 2013 GMC Yukon Denali with 6.2 Liter
- Article: Brake Controller 7- and 4-Way Installation Kit (ETBC7)
- Q&A: Lug Nut Torque Chart for Trailer Wheels
- Q&A: What is the Difference Between a Class II and a Class III Hitch?
- Article: Trailer Wiring Diagrams
- Q&A: Should I Get Loadlifter 5000 Or 7500 For Towing A 15K Fifth Wheel
- Article: How to Measure Your Trailer Wheel Bolt Pattern
- Q&A: How to Replace a Lance 6-Pin Plug w/ a Standard 7-Way Connector
- Article: How to Measure for Trailer Hitch Drop
- Q&A: Firestone Air Bags for 2026 Ford F-350 FX4 Dually
- Article: Wiring Trailer Lights with a 7-Way Plug (It's Easier Than You Think)
- Q&A: What Is An OEM Prep Package And How Do I Know If I Have It
- Article: 5 Things to Know About Weight Distribution Hitches

