Update
I cut off the cat, it was destroyed! Then i ran the car down the street with no exhaust, it seemed to run ok but still wasn't shifting right. Then I dropped the trans pan, added new fluid and filter and disconnected the battery overnight. Also I replaced the upstream 02 sensor. I ran the car again, I was so excited cause it started out running fine then later it slammed into 2nd gear and then seemed to slip. Do I have a bad front band? thanks