Do new vehicles need after market trans coolers?

No and if you install one your dealer may use it as an excuse to deny warranty coverage if the trans has any kind of issue.

I have digitally monitored the temperature of the ATF in my last 3 vehicles, all with just factory trans coolers. None ever got too hot when towing.

So my answer is no, it's not needed.

A cool transmission is a happy transmission. If you have the factory tow package you should be fine. It won't hurt anything to add a transmission cooler. Doing so will also help keep your engine coolant cooler, assuming the transmission fluid shares the radiator with engine coolant.

ROBERTSUNRUS wrote:
:) Hi, the factory coolers are rated to handle the tow ratings of the vehicle; So nothing else is needed. If you tow beyond the factory ratings, well, you shouldn't. So no.

Good answer. X2

:) Hi, the factory coolers are rated to handle the tow ratings of the vehicle; So nothing else is needed. If you tow beyond the factory ratings, well, you shouldn't. So no.

If the truck has a tow package there will often be upgraded coolers installed. If you have an oil and transmission temperature gage it should answer any concerns.

No