Product review (5 stars): My Theory of Why These New Rods Work
I was very skeptical that a changeout of the suspension rods could make a difference in the unbalance problem in our Kenmore washer.  But they did, the Remove & Replace took me less than an hour, and my wife loves me again.  My theory, for whatever it's worth, is that the original suspension rods were very close to producing a resonant frequency, and with a few year's use, they got even closer, making unbalance more frequent.  These new rod assemblies have springs with a different k-value, and this changes the frequency where resonance is apt to occur.