trans cooler

If you have threaded fittings (female) on your cooler you can put quick disconnect fittings on it . Take the cooler to a place that makes hydraulic hoses . they can make up what you need . But you have to know what you want . I have "quik connect" fittings on mine to a -6 braided steel flex hose . the same on the tranny end . NO leaks ever , can't break it , lasts forever and -6 hose carries more volume (a good thing)
i do not have threded lines on my cooler this it is. B&M 70268 B&M Hi-Tek SuperCooler Medium - 13,000 BTU Rating did you run the hose all the way to the transition?