I just bought a Tru Cool 4454 transmission cooler for my 05 Tahoe with 5.3 engine. It doesn't have the tow package so there is no external cooler. Should I run it in combination with the cooler that goes thru the radiator, or should I bypass that cooler and run it by itself? I bought a 23' boat last year and installed a tranny temp gauge, and noticed when towing on really warm days ( 85-95 degrees) the tranny temp was really getting up there. What have you guys done, or what do you think? Thanks!