tranny cooler- oil cooler

Typically I've seen transmission coolers with smaller fitting sizes. Usually 3/8", where engine oil coolers I usually see as 1/2" size fittings.

That is the only difference I've seen, otherwise either should be rated for use with engine or transmission fluid. Though a tranny cooler typically is larger, to dump more heat. Unlike an engine, they don't already have a cooling system.
 
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