Help selecting an auxiliary transmission cooler

[skiffle]

I've towed a 6x10 cargo trailer 40k miles with my 2011 Pathfinder these last 2 years - without a single problem. Odometer is nearing 100k (when my extended warranty ends) and knowing about the transmission cooler problem possibility I want to put in an auxiliary cooler to prevent any mishaps.

My local mechanic is good and cheap and told me to purchase an auxiliary cooler - recommending Summit Racing for a larger one due to the fact that it is a 100% tow vehicle. There are literally 1049 options on the Summit Racing website.

Do any of you Pathfinder aficionados have any specific recommendations?

[disallow]

i recommend not bothering with the aux cooler.

[eieio]

i recommend not bothering with the aux cooler.

+1!
an aux cooler adds plumbing, mounts, and possible restricted air flow through the radiator
if I wanted or needed additional cooling with a by-passed internal cooler, I'd just replace the radiator with an updated or upgraded one, and utilize the internal cooler

[smj999smj]

For what you'll pay for a good auxiliary trans cooler, you can get an aftermarket radiator, instead, which aren't known for having cooler failure problems. Plus, liquid to liquid coolers are far more efficient that air to liquid coolers, anyway.