Just bought a 1984 300D Turbo with 280,000 miles. Car looks like it has been very well maintained, however, I have no records as to whether tranny fluid was ever changed. I drove it about 100 miles yesterday. In the morning, I experienced lots of "flaring" and hard shifts. I was hard pressed to get it over 45 mph with the pedal to the metal! In the afternoon, it seemed like a different car. I was cruizin' up Rt. 95 at 65 plus. The tranny fluid is pinkish red as I believe it should be. Should I take it to Jiffy Lube and have them perform the complete fluid flush and replace or should I leave well enough alone? The car hadn't been driven in a about month before I bought it.