my 2001 when I first purchased it with 38,000 miles, the tranny would kind of mis second, you know, shudder a little before it locked into second gear, even under very very light acceleration, well I had a 90 day warrenty from the dealer, so I figured, if the tranny's going, I'm gonna make damn sure it goes before the warrenty expires. So I canned on it, and made it shift as hard as it could, and now wouldn't you know it? it shifts as smooth as they day it came off the assembly line. Still origional tranny fluid and filter, although, its aproaching 45,000 miles, so I'm going to have it flushed and changed here pretty quick. Good luck with your problem. I would just drive it. And the hum your talking about, are you sure this isnt a wheel alignment issue? Just my two cents worth.