I went off-roading a couple of weeks ago, when I returned I noticed that there was abnormal knocking coming from the front left wheel, it sounds like a rock knocking a piece of metal, and was quite soft (can only be heard when windows are closed or in quite environments). Furthermore, it only happens when I depress the throttle and the RPM is between 1000 to 1500. I asked one of my friends and he said it could be the clutch. I might have damaged it while off-roading. But besides the knocking, I havent find anything wrong.What could happen to my JK? Can anyone help me?THX a lot!!!