I recently purchased a 2018 F150 with a 2.7L engine and 10-speed transmission. When towing, my transmission temperatures are between 210-220 degrees. I realize now that it only has a heat exchanger and no cooler for the transmission. I am considering adding an auxiliary transmission cooler and possibly an engine oil cooler (if available).
Will installing an aftermarket cooler void my factory warranty? I’ve found aftermarket coolers that are more cost-effective than factory options.
Void it? Not necessarily. Will the dealer hassle you about it? Yes. Check your owner’s manual for towing transmission temps; I think you’re within the normal range.
By the way, what are you towing?
A towing tune might help. The stock tune may not be locking the torque converter as much as it could. With my tuned 3.5 EcoBoost, my 6R80 trans has never gone above 208-210 degrees.
Thought I would post the above video to prove the concept.
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If your F-150 has the optional trailer tow package or max tow package, it already has sufficient transmission cooling capacity.
The transmission temperature redline is 225°F, so you should be fine.
Without a towing package and only a receiver hitch, you’ll need to enhance cooling by upgrading two components:
Replace the radiator with the higher-capacity version found in towing packages.
Upgrade the engine fan to one with higher cooling capacity from towing packages.
Your current oil-to-water (OTW) transmission cooler is adequate if you can improve coolant flow through the radiator and increase airflow to expel more heat. Previous F-150 models used an auxiliary oil-to-air (OTA) cooler in towing packages, but since 2018, higher-capacity radiators and fans have optimized the efficiency of OTW coolers.
For an engine oil cooler, consider a “sandwich” adapter that fits between the engine block and oil filter. You can then install any compatible oil cooler under the hood. Alternatively, opt for a complete oil cooler kit that includes the sandwich adapter. Here is a link to the adapter: [link]