I just bought a B&M 70255 trans cooler for my powerglide trans and installed a new rad minus trans cooler. The B&M says it works best in series with OEM rad cooler. Am I at risk for not using the rad cooler as this thing seems pretty small. Anyone got any experience with this? Btw if I am only using the trans cooler do I care which line goes to what? It's just a loop circuit anyway.