If you take a neglected tranny with ancient non-synthetic oil in it
and flush it with fresh synthetic fluid, it's possible to remove
enough varnish from the valve body that shifting problems arise.
Also, in the 70's, synthetic oils didn't have enough seal swelling
material in them, and rubber seals saturated with mineral oils could
shrink when the fluid was changed, resulting in failure. This
particular issue was addressed when I was in high school, shouldn't be
a problem now.
The only other issue would be a bunch of scale collected all of the
the tranny that comes loose with the synthetic, clogging the filter
and causing issues. Easily addressed by changing the filter again.
Otherwise, if the dirt and varnish is all that keeps the tranny
working, it's shot anyway.
Peter
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