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Additional trans cooler recommendations

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Hi all -


Did quite a bit of searching and couldn't find much info on aux trans coolers for towing. We bought a tent trailer that's 2k unloaded and 2.5k gawr, so right within the Journeys limits. We went on a 100mi trip on a 90+ degree day and the trans got up to 195 degrees a few times. 


My understanding is that temp is fine, it's over 200 when varnish can start to build up. But if we had more gear or people, I'm thinking we would want an aux trans cooler.


Has anyone installed one with some before & after testing? I'm curious how much it helps, and I assume you had to break the dealer seal to add additional trans fluid?

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