Tremec t56 magnum. Is that not the same tranny in a hellcat?
If so. That's a bad ass tranny. Iv beat the crap out of the one in our cat

1970 barracuda convert. 1 of 59
1970 pro street A.A.R. clone (panther pink)
1971 charger
2015 hellcat challenger. Redline red
2014 quad cab 4x4 ram 8 speed hemi