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A big reason these fail more on the LifeLike units, is the axle stubs are slightly larger diameter than the Athearn ones. If you replace them, I would paint the Athearn wheels that come with the gears, and use those instead. What little you lose in appearance, you gain in reliability and longevity.
This has zip to do with the subject, which is an Athearn SD45, but a help for the Proto 2000 owners out there.
I have had problems with these too in my business, I have gotten in I think from my work records 4 locos that have had that problem. Quick fix but still, they seem to have a tendency to do that. Mike