I took my 2007 G6 GT Convertible to U-haul to have a transmission cooler installed. It called for 1 hour labor. After 2 hours they had removed the bumper/grill/headlights only to find out their Hayden cooler needed a special fitting which they didn't have. They called to order it & was told the cooler couldn't be installed because there was no tranny dipstick. After 4 hours I drove away without the cooler. Of course there is a dipstick but now I'm concerned if a cooler can be installed & if so which ones others have had luck with.