Re: another broken gm trans.
The combo you are running puts a lot of stress on your drive train. Any misalignment in your drive train components will cause failure such as cracked housings. Never built a truck, but have done quite a few muscle cars, and have found cracked casings are almost always a result of uneven forces being applied.
Personal opinion is a good thing, and everyone is entitled to one. The hard part is separating informed opinion from someone who is just blowing hot air....