Aluminum case 833 identification

Passon Perf. sold me a nice HD alloy case. It's been in Street-Duty since around 2004/2005 I forget. It's been taking everything I've been dishing out to it. But I only have a 367 with 177psi cranking pressure, and 430 hp by the 660 trapspeed. And the 325/50-15BFG DRs,I have found out, with my suspension, are no different than the 295/50-15 TAs; as in they spin forever, sorta pointing to the trans not seeing much in the way of stress,lol.
Good luck in all your strategies.