so, my '97 GPGT has 210,000 flawless miles on it and suddenly it seems to have a major issue. The trans has been slow shifting into 2nd gear for about the last 50,000 miles but I would never describe it as slipping - more like a slow shift instead. well, out of nowhere, the car seems to have lost 2nd gear. I can accelerate in 1st all the way to 30 mph, then the car goes to shift and its like its in neutral. Now, if I accelerate in 1st, I can get it to 30, floor it and it accelerates really roughly to 45 mph and if i let off the gas a bit, it goes into 3rd gear, then overdrive. This is what I observed by watching the tachometer. Now, I still have flawless reverse and 1st gears and NO service engine lights. Anybody have any ideas? the tranny fluid is full BUT is pretty dirty. Awhile back my mechanic said not to change the fluid because its supposedly bad for "high mileage" transmissions. What can I do to diagnose this better? is it common? I drive the car for work everyday and I don't know how long I can manage it like this!! My uncle has an OBD II scanner from craftsman - would this be able to tell me anymore info if I plugged it in while driving?