So, a week or to ago, I switched out my tranny fluid for red line mt90 in
my (manual transimission) '84 vanagon.  Right after the change, it shifted
like a dream---like butter.  Now, though, htat super-smoothness is
definitely gone, and the shifting is maybe stickier than it was before.  I
don't see a leak anywhere.  Anybody have any ideas?

Thanks a bunch,
wes