Product review (4 stars): Common part of good quality
This drive block was used to replace a supposedly malfunctioning block in our Sears washer (which is made by Whirlpool).  Symptoms of a malfunctioning drive block include a loud snapping sound as the transmission shifts into different modes, and clothes that are still sopping wet (meaning the drum did not spin during the spin cycle).  In this case, we had the snapping sound, but only occasionally had the problem with the spin cycle not engaging.

After replacing the drive block, there is still a snapping sound but after more than a year, I have yet to encounter a load of sopping wet clothes.  So hopefully the new drive block is doing its job.