Thanks to everyone for the info. Getting it serviced. When I figure the service could give the transmission a few extra years the cost is worth it.
I took it to an established transmission shop recommended by someone that's used it and knows the owner. The owner, an older guy, said if it was his after this many miles and years he wouldn't flush it but would replace the filter & drain and replace what fluid he could. I asked if that was because flushing might damage it and he said probably not but why take a chance.
Excellent advice. Sounds like a good honest tech.
