1996 Nissan 200SX auto mileage: 97,000. I think I'm having transmission problems, every time I get on the freeway and drive 70 mph, the rpm will be about 3000. When I go over 70 mph, the rpms will go over 3000 and then the battery and brake lights will come on (flashing). I can also duplicate this when driving at lower speeds in city traffics, when I press on the gas, the rpms will rev above 3000 to 4000, and then the battery and brake lights will start flashing, until the rpms go down below 3000. I think it's having difficulty finding the right gear? I'm just confused by the flashing battery and brake lights and the rpms. I'm not a car expert, as you can tell. Any help would be appreciated!