Some sort of Grinding Sound During Agitation...

Hello, I have this Maytag Atlantis MAVT754EWW that has been working well (since we purchased it from Lowes back in 2005) up until a few days ago when this washer began making like a grinding noise during the washing/agitation cycle.

The washer will make this back and forth grinding sound with a load or without any load. No difference.

The agitator seems to be turning left and right as it’s suppose to however it’s doing this with an awful sound.

It runs through the spin cycle well without any trouble at all. I turned the machine over and verified the belt is OK. The tension also felt OK as all three pulleys would turn when manually pulling the belt. I removed the belt and checked out the three pulleys, they seemed to be turning well without any interruptions.

Any ideas as to what this may be? Does this sound like a (transmission or is it called a gear box) issue?