727 Torqueflight Won't Engage

Recently changed oil in 727 torqueflight transmission and now nothing will engage except park. Every gear the car can be pushed as if in neutral. I dropped the pan, checked for anything that looked out of place, new gasket, new fluid and let it idle while going through the gears to check for proper fill. Same issue. Owned the car for about 3 months now never any issues except for a little bit of rough shifting from 2nd to 3rd which is why I figured new fluid may be a good idea. I used ATF+4. Not sure if this is the issue since I've read some people use it with no issues and others dont recommend it for the early mopars. Any advice and/or help would be great. Thanks.