Triumphrider has a good suggestion. Start it w/o the belt. While it's off, check the idler pulley, alternator, water pump, etc. for looseness or rough spinning. Would be coincidental if something like the starter started making noise just when you did the belt, but it can happen. Also, the 3.0s have a habit of the cam position sensor going bad. It's in the right rear, on top of the motor, where a distributor would sit. The CPS makes a chirping/grinding noise when it starts to go bad. When it fails, it can take out the engine, because it drives the oil pump. If the noise is coming from the rear of the engine, check it out. Easy to do, like pulling a distributor, but you need to be careful to keep it in synch. There are a lot of discussions on here about how to change it.