I've seen this on the 97 transmissions many times. Here is the scenario I usually see. The roller clutch starts to lose parts. The parts make it into the pump and bushing. The trans is on it's last leg. Maybe you have a fluke pump problem or a cracked pump, I however doubt it. Before you do anything more drop the pan and look for unusual parts. It could be cheaper to replace the trans than to repair it and then have to replace it a month later.