Strange noise from under my car
 

Ever since I boughtmy '97EX sedanthere has been a strange grinding/knocking noise coming from underneath the car on the passanger side whenever the car is in gear and in motion. When the clutch is pressed there is no noise, when I am coasting in neutral there is no noise, but when I am in gear and and in motion it is very noticable. Obviously I think it's clutch or transmission related, but the clutch feels strong and responsive and I feel no vibrations or alterations at all in the pedal. Anyone who rides in my car can hear the noise and nobody can tell me what is causing it.