You replaced the ignition on your 1994 4.6 Tbird now the chime sounds every time you open the door without the key in the ignition What would cause this It started after I changed the ignition switch?

It might be a fault with the anti-theft feature. Ford has had several recalls due to this. Web search for safety recall on faulty key-in-ignition chime. I had the same problem with my 1998 Ford Explorer Sport although it started chiming all by itself. On my Exlorer there is a set of 5 wires in a yellow sheath running from the ignition module to a brown connection point/harness in a very uncomfortable position directly under the steering column above the pedals. I unplugged the connection at this point. The pinging, or ringing chime comes from the multifunction computer located under the dash behind the radio. Hope this help.