The trans cooler is in the lower tank. Nothing short of routing the exhaust through the radiator is going to blister the paint off. If the paint is damaged and that's not just dust in the pic, my best explanation is that the dust being pulled through the rad wore the (very thin) paint off. It's not evidence of a failure.thinking on it I think its just that the entire rad was hot and the extra heat from the trans cooler would have done that discoloration.
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