Harsh 2-1 downshift on a 2004 Dodge Avenger

What is your question?

Upshifts fine, no slipping. Downshifts fine too until the 2-1. Hits hard in first gear at slow speed. If you come to a complete stop fast, you don't notice anything. But roll to a slow stop and Bang when it hits first gear. Any help would be greatly appreciated.

What makes this problem better or worse?

Always the same. Hot or cold

How long has your 2000 Dodge Avenger had this problem?

A few months