Transmission Cooler Recommendation for a 2009 Yukon XL SLT 5.3 Towing an 8000 lb Camper

Products Featured in This Question

Derale Radiator Adapter Fittings for GM

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Derale Transmission Line Compression Fitting Kit - 5/16" Line to 3/8" NPT Barb

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$22.46

Derale Transmission Line Compression Fitting Kit - 3/8" Line to 3/8" NPT Barb

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$22.46

Derale Transmission Line Compression Fitting Kit - 1/2" Line to 1/2" NPT Barb

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$23.43

Derale Snap-In Radiator Adapter Fitting for GM

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Derale Series 8000 Plate-Fin Transmission Cooler Kit w/Barb Inlets - Class IV - Efficient

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$114.41

Question:

Overheat when towing.... Im interested in towing a 8000# camper with this Yukon and while I have successfully towed 180 miles in 85 degree temps Ive also experienced overheat at 98 degrees outside temp. The 6 speed transmission performs well and does not experience any shift scheduling, however, the temps can really become disturbing. I do not plan any mid west trips but under normal driving in non-hilly terrain Id like to protect the transmission from over heating. I purposely purchased this rig for ride, comfort, and fuel economy when not towing but an occasional camping trip around Michigan and Ohio without the fear of over temps would really be nice. What system would you recommend?

asked by: Thom A

Expert Reply:

When it comes to transmission coolers, I recommend choosing the largest transmission cooler that will fit into the available space. The ideal place to install a transmission cooler is directly behind the grill, in front of the radiator and A/C condenser. I would recommend measuring the available space so you know what size cooler to look at.

For your 2009 GMC Yukon XL SLT with the 5.3 liter engine, I would recommend using the Derale Transmission Cooler, # D13504. This is a class IV cooler rated for up to 12,000 lbs gross trailer weight. Combined with your factory cooler, this Derale cooler will perform well when pulling your 8,000 lb trailer.

These coolers include a universal adapter fitting, but if you would like a vehicle specific fitting you can use either the Derale Snap-In Adapter Fitting for GM, # D13035, if you have a snap in tube fitting or the 5/8 Inch Inverted Flare Fitting, # D13018, if you have inverted flare fittings. You could also use compression fittings if it is easier for you to just cut the transmission line.

I would recommend measuring the diameter of your transmission line going to the radiator and match that up with the proper compression fittings. The most common size is 3/8 inches, but it would be safe to measure first. I have attached links to the compression fittings that we carry, part # D13031, D13032, D13033.

I have attached two help articles on transmission coolers for you to look over, as well as an installation video of a transmission cooler on a GMC Yukon XL. The vehicle in the video is slightly different from yours, but the installation process will be the same and it should give you an idea on what to expect.