Whirlpool top load washer won't spin - replaced coupler and clutch

[kodiakmook]

whirlpool top load washer won't spin. replaced coupler and clutch. Still doesn't spin. When replacing the agitator after changing the clutch, I noticed the pins on the plastic washer at the top of the shaft doesn't properly nestle into the shaft. It appears that maybe the spanner nut came loose and the tub slid down on the shaft? Is that something that can happen? The nut seems tight... can't turn it by hand or tapping with a hammer/screwdriver. I did notice there are fine metal shavings around the top of the shaft which would indicate something was slipping. Any ideas?

[Washaman]

Drive block.

[Washaman]

[kodiakmook]

Thanks for the advice. The drive block was definitely shot. It's now replaced. The washer now spins, but there is a loud "metal-on-metal" squeal when the spin starts. the squeal goes away once it's up to full speed.

[Washaman]

  Good to hear! You might want to check the installation of the clutch again. Make sure its seated correctly. Also double check that drive block.