For at least the past year or two, my 02 Sonata vibrates when in Drive (D). It's smooth as silk in Neutral (N) or Park (P). I can only assume it's the trans. It seems to be more prominent when it gets cold. However, after driving a few miles, it seems to lessen as if the trans or something has "warmed up" a bit. Another odd thing it does when it's cold (getting in the 50s or less) is going from 1st to 2nd gear. I notice that the revs will go up to around 2500 and it will engage
2nd gear but with a slight thunk as if 2nd gear was stuck for a brief moment but once it is engaged, it works fine afterwards. I don't think it's related to the vibration but it could be a symptom. Anyone had this issue? I'm pretty religious about changing trans fluid and the last time I did was last year (August) about 9,000 miles ago so it's not quite yet due for another trans fluid change.- Thee Chicago Wolf [MVP]