Doc, I fully agree, a ring and pinion is naturally the way to go. But Summit Racing, and Mercedes Benz hasn't returned any of my phone calls.
Now if you know of somebody who's secretly forging new ring and pinions for our painfully unimpressive differentials, but you've taken an oath of silence, then I won't push it any longer.
But I don't think using a completely new housing is impossible.
To be honest, I've never even been under my differential to exam how much space it actually takes up, or even how it is fastened to the chassis, but I'm not suggesting replacing it with a 9 inch, a 12 bolt, or even an 8 3/4".
There are several "Asian" differentials I think could be modified to work. Yes it would take some money for R&D, but their diminitive size should fit under a Crossfire.
Doc, you know I'm not a Drag racer any more and I don't own an SRT. But I don't need 150 mph capability either, and I have ALWAYS thought all my car needed to wake it up would be a 3.73 gear.
As I said, for those serious SRT drag racers, a 4,44 ring and pinion and some DR's should be dipping into the 10's with the SRT's H.P. It's been done before.