If I'm not mistaken, not only is the engine Mitsu, but the whole car is basically Mitsu. The Sebring sedan is Mopar.

The Sebring coupes were not tops in durability. Harder to find parts for than the sedan and more expensive to work on. Trannies are a weak point and I have seen more than one replaced, only to have to do it again.

Personally, I feel it would be a gamble on whether a different tranny will be the last of big expenditures on the car. You may consider selling it for what it will bring and move on.