Product review (5 stars): Buy a spanner wrench to make it easy to remove and to properly tighten after replacement
This is just what I needed to repair my dad's washing machine.  It was fairly priced and shipped promptly.  If your machine is making a clunking noise and it turns out not to be the clutch ( which we changed first) it may be the drive block that is causing the problem.  The grooves wear down and the break will slip causing the clunking noise.  The part is cheap and about a 45 minute repair.  Check Youtube for how to replace, it is not difficult.  Buy a spanner wrench to make it easy to remove and to properly tighten after replacement.  This cheap part fixed the Kenmore/whirlpool washer that was only 6 years old.