Your statement that you're considering replacing your Dodge-Cummins with a Dodge Charger SRT8 or Challenger suggests you may be driving the wrong vehicle for your driving style.
One could say that I suppose. I dont tow or haul anything. I got the truck for a daily driver, and something to play with. Thus the reason for the auto, autos are faster than manuals. I knew full well the stocker would go out at some point. Except it lasted longer than the built one has. And I need 4x4 in the winter.
This is essentially the same transmission I got a year ago. Except in Aug. or Sep. the convertor blew up. Apparently Suncoast had a bad run. Now it looks like a shaft is snapped. But heres the thing, I was doing 70 when it snapped. I got into it after it had locked in OD and was trying to see what boost psi it was setting a CEL. Pulled fine, then all of a sudden POP!
Am I scared of getting on it? No. Thats why I have the biggest baddest transmission one can get. Apparently not though... I dont floor it from stops but rarely, Im not in 4x4 and doing boosted launches ever, Im not pulling at the track, Im not running down the quarter, Im daily driving my only mode of transportation. Im not easy on it, but I sure dont abuse it or mistreat it. I will occasionally kick the rear end out. Ive wanted a built, twin turbo Dodge/Cummins back before anybody even ran twins on the street, and making 400hp at the tires wasnt very common. Im a horsepower freak, a car guy, and I expect my vehicles to hold up, especially after I build them up with the best of the best...
Theres a better idea of how the truck is used. Im not making power that I should be snapping billet shafts. Not in my opinion. If I was making 700+ I wouldnt be surprised. But 500 is SO easy to get, and my trans is built to support so much, that there just doesnt seem to be an equilibrium between my power and parts breakage, if that makes sense... ?