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I have replaced the rotors and in doing so, also properly torqued the wheels when putting them back on, and all of that seems to help. I may still get my tires Road Force balanced in the future. Thanks for all your help. Now I have a new problem with the A/C blower making a ticking noise while it's on, but I'll post that in another section.

I have a 2007 SEL AWD with about 55K miles, and I have a vibration in the steering wheel that occurs (or is most apparent) from about 65+ mph. I have had the tires balanced, rotated, etc., and I have just replaced them a few weeks ago for general wear. Even after the new tires and an alignment, I still get the vibration. One thing I have noticed of late is that it occurs most noticeably on my way home from work when the temperature is around 85-90+ (I live in Texas). In the mornings, when the temperature is around 75ish, I don't feel the vibration at all, or it's very subtle. I am at a loss as to what might be causing it. I have had to take my Edge in several times for transmission problems (bad calibration, faulty sensors), and I am concerned that maybe some of the issues with the tranny have caused permanent damage. I still have my extended warranty, and I sure don't mind bugging the hell out of them to fix my car, but I am pretty handy, so if it's something fairly cheap/easy, I don't mind fixing it myself. Thanks in advance for your help.