I have a 2000 Dodge B3500 Van with the 360 engine.

I want to add a transmission cooler as I will be towing a trailer. I am looking for advice on what is the largest size cooler I can add and what brand or other info that may be useful.

 

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They all work the same way. Personally, I am partial to the flat-tube, high density fellers. (lots of fins between tubes) I don't think it's possible to go "too big"... so, I would go for the largest size that you can physically fit in the space available.