400 big block - a883 od

As a streeter, I have had no trouble with any of the aluminum cases, and the cast iron ones are very heavy.
But I finally broke down and bought a Passon Perf, HD aluminum box, now I feel like I'm SuperMan, when I slam that featherweight home.
I also have not had any trouble with any A833 gears in any box with the exception of the glass overdrive gears. I blew three of them up with 335 hp. before I gave up.