I posted this elsewhere, but thought I might get some different opinions here.

I was driving to the junkyard today and got about 30 miles down the highway. I stopped for fuel and after driving away, my 300SD was not wanting to shift out of 2nd gear. Even when I manually shifted it in 3rd, it would not shift. Sometimes shifting to third, then back to drive would cause it to shift into 3rd. The car will not shift into 4th gear at all. Reverse and 1/2 gears work fine, although it takes about 3500rpm to get into 2nd.

I've only owned the car for about a week, but noticed no other transmission issues besides some slight flaring going into 3rd gear (wouldn't have bought it with tranny issues). I drove it home over 150 miles and have driven it 6-10 miles daily and have seen no issues. I'm hoping that it isn't time for a rebuild.

The fluid is clean looking, but was overfilled. I siphoned out some which did nothing. I checked the kickdown switch which is not stuck. I might try unplugging it tomorrow. I didn't see anything wrong with the bowden cable.

Should I drain and change the transmission filter? Where should I go from here?