I have the 8 speed in a hemi ram and a hellcat car and they are flawless in both of them. Maybe it's the little motor/8 speed combination that doesn't work.
In my opinion, any Chrysler should have a hemi in it anyhow.
There are a few 8 speeds. V6 are 8HP45, hemi 8HP70 and hellcats are 8HP90's i believe