My 1998 Taurus SE with a Vulcan 3.0L V6 with an AXOD-E/AX4S transmission with 118000 miles has twice the two last times driven (both around 60-65 degrees F and dry conditions) experienced a sudden drop in engine and vehicle speed while at highway speed (60 mph). The car was properly warmed up prior to starting highway speed and after about 5 miles at 60 MPH, the car suddenly dropped from around 60 MPH @ around 2050 to 55 MPH @ around 1800 on flat ground. I had nothing else on such as lights, radio, cruise, fan, etc... and was in Overdrive. It was a noticeable decrease, much like taking my foot off the gas pedal, but I didn't change pedal pressure. I've previously let my foot off the gas and the car doesn't slow down like this. This happened again a few miles later on flat ground then again while going down a large hill. Each time the car felt like it took some effort to get back up to speed. I continued for another 30 miles at highway speed 55- 60 MPH without another incident, but the car seemed to struggle to stay at speed. I replaced the VSS Sept 09 at 113000 miles, last transmission flush was Sept 08 at 108000. I haven't done any major work on either the transmission or engine. I've been told my fuel pump is operating on the low end of the normal pressure range. My fuel filter was changed Nov 09 at 115000. I haven't seen anything like reading other threads. Someone else drove the car today without incident and doubts the transmission is failing. I've hooked up a code reader and no codes were found. The transmssion fluid is in the operating range. The car is not driven hard and normally sees highway miles.