Any updates on your problem? Did changing fluid and filter help?

I'm in this boat. I have the 87 TDT. Is that same tranny? Can't find spec in the fsm. What tranny is that? Its happened twice now, going up the same hill after about an hour of driving. It slipped and i barely made it up. Then stopped at top and it went. Going to change fluid and filter before driving more and see if that helps.

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What Would Rudolph Do?
1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius