I started tearing into the transmission yesterday. Not too bad, not great. I found metal shavings in the oil, and it's been pointed out to me that there appears to be wear on the 1-2 clutch shift dogs. If that's so, there's probably wear on the 3-4 dogs. I won't know for sure until I remove all the components and clean them with kerosene so that I can see all the surfaces well.