Spin Cycle (again) on Whirlpool Washer

Spin cycle was making a terrible noise and then just quit. Will restart but the noise is real bad and will not finish the cycle. Checked the coupler, it is fine and was replaced about 2 months ago.

With motor and pump off and turning the drive by hand (other end of coupler non-motor side):

on the drive, I can rotate it counter-clockwise indefinately with no problem. Clockwise it will rotate and then stop. I can not budge it. Also, when I try to move the agitator by hand, it is really frozen in place now. Agitator will not turn by turning drive train with motor disconnected.

Can you recommend a solution with parts required and a link to the procedure - or has it met its demise.

Thanks for past and current help.