Vibration in front-end

I have a Focus ZX3, zetech engine with 88K miles on it. I started noticing a really loud vibration coming from the dash/front end of the car, that reverberates as I am in reverse. It also vibrates in first and second gear a little bit, but doesn't vibrate in the 3-5th gears.

Dad thinks the clutch is going. Any other guesses?

i dont think its the clutch wearing out...youd notice a HORRIBLE lag in acceleration if the clutch was going. its probably just the transmission itself. (you might even want to have the front end alignment checked.)