Have a 2004 Chevy trailblazer 2wd that the transmission is acting up. It seems to be slipping a little. Not all of the time and mostly in 2nd gear. It just started a couple of days ago and seems to really be worse after driving for a long period of time. I checked the fluid level and it is ok. The battery died and it started acting up later that evening. I don't know if that could be related or not. Anyway, any ideas on what to check? Or a good reputable place to take it and have it checked out?