Transmission plumbing question

I have done them both way and find very little difference. I use a infrared thermometer to do my tests with so I see actual results.

When I worked for Hyster forlklifts as a mechanic they introded a new style of lift in 95 and from the factory they had the fluid running through the radiator first then through the aux. cooler. They had engine overheating problems (mainly in enclosed factories) and we tried everything to keep them from overheating and didn't gain much. Finally we switched the trans. cooling around so it went through the aux. cooler first and then to the radiator and that solved the overheating problem. The trans. didn't run any hotter either. I know were not talking about a forklift here but the principal is the same.

Some aux. coolers also have an electric fan on them to make them more efficient.