Just got the transmission serviced, and a new cv, front driver's side axle. Right after the axle was put on (about 1 week after the transmission service) I noticed a strange vibration that started a second or so after breaking, but only after going a certain speed (at least 35). The vibration stopped when I took my foot off the break. The vibration got worse, and it seemed the car vibrated when it 55 mph, and my mechanic put in a different axle (a better fit, he said), and tuned up the car. The vibration when driving seemed to disappear (although I haven't gone on the highway yet), but the vibration after breaking now occurs right after breaking, in drive, but disappears when I put the car in neutral or park. Any ideas what could be causing the vibration? This is a 2003 Subaru Outback.