Run the cooler as a stand alone outside of the stock GM in radiator cooling. I have been running trans coolers as stand alones for 35 years and have never had a tranny failure. My 01 GP uses (2) long/dana coolers (18,000 GVW each), total cooling 36,000 GVW, for 120,000 miles now with zero issues. DD GP 365 days a year in very hot and very cold weather.Tranny still perfect at 205,000 miles.....