Back in 1974, my Dad and I towed, with a tow bar, our 31 Roadster from Tacoma, Washington, to the national meet in Long Beach, CA. Running probably 60+ MPH, probably faster when I was driving, and made the trip with no problems. 45,000 miles later I am still running the roadster and have never had a transmission issue. We did not stop and run the motor at any time. I am going to say that if there is oil in the transmission, that a 200 mile run won't hurt anything. I think that trip was probably about 2,000 miles.