You won't find any.

The new transmissions are 6 - 8 speeds, and all use electronic controls.

Maybe a 5.7 Hemi out of a late 300 with its stock transmission would fit, I believe it's a 6-speed.

There are 6-speed variants of the GM 4l80E.

Off the top of my head I can't think of a single 5-speed auto that would be found behind a V8.

R.