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Another thing you could try is one of those "transission fix in a can" goops. In addition to the "particles that broke free" scenario I've also heard of the "the old fluid was so full of old clutch etc. that is was much thicker than new fluid" explanation. While the "it won't downshift" sounds like a governor to me, the "won't upshift" sounds like insufficient pressure. A viscosity improver might help there.
"won't shift up" sounds like the vacuum modulator (I almost said "thing-ee", before the brain cells lined up right; this from a tech school grad!) If the vacuum line came off (but, of course you'd have seen that), or clogged, or just not working.....I have never seen, let alone driven an automatic 900...jvanabra, if this thread is 15 years old, please don't tell me...
 

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Discussion Starter · #23 ·
UPDATE: So far so good. No issues or oddities in shifting whatsoever. Very pleased (even though I'm still not sure exactly what I did to remedy the problems).
 
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