98camaro5

I recently had a used t56 install in my 98 camaro. The t56 came out of a 2002 blackbird with only 11,000 miles on it and had no problems. Now that it's in my car it won't downshift from 3rd to 2nd gear. It's really hard to get it into 2nd gear. If you go from 1st to 2nd it goes perfect. Does anybody know anything that I could try