The 78 seems to surge before shifting into 2nd every once in a while.
Just a few times so far but enough to notice that it's happening.

What does this mean, how long until the tranny does this a lot, and
where should I take this to get it fixed.

I checked tranny fluid and COLD it's about 5 mm above the top range
of the dipstick. It usually shows nothing at temp and idleing.
I added some a while ago, months and then didn't drive it.

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Ginny in Denver-ish
78 300SD, 265K (mine)