I have a 93 Nissan Sentra with a 4 speed automatic. I was doing a pan drop and drain so I could change the filter and replace a gasket. I could not get the filter off. It had about 12 screws holding it to the valve body and all but 1 screw came off. The one that couldn't come off kept spinning so I just sprayed the filter (screen) with some brake cleaner and just replaced the gasket to the pan. Of course I cleaned the 2 magnets that were in the pan. Does anyone know if the trans have a nut and bolt holding the filter in place?