Originally Posted by GSF1200S

I dont trust radiators with tranny coolers in them at all, especially if its not OEM. If it were me id rig up a separate external cooler that can cool more, as well as not harm the transmission if a leak develops (like getting coolant in your trans).

Anyways, its got to be thread related. Id take the radiator back and get a refund, go to another parts house and try their brand. Perhaps youll have better luck?