I have a 2005 Nissan frontier. The truck runs and drives perfect. Just last week I started feeling a shutter on the highway. It felt like it was happening when the car was trying to go into overdrive. Checked my tranny fluid and my antifreeze and the two are mixing together through a faulty automatic transmission cooler that's attached to the radiator. My anti freeze looks like Pepto-Bismol. Bottom line is that my transmission will go out any minute now. Does anybody have any opinions about aamco or some of the big chain tranny shops. Or do you think that I should stick to privately owned shops? I think my best way to go would be to rebuild the transmission and fix the radiator. I just know that the stealership wants 6,000. Anyone have any recommendations?