I blew 2 of them out until I changed to a Dana 60. I was using a power lock sure grip in a 742 case. Every time it would take out the cross shafts (even after market ones without the holes for the buttons). I came to the conclusion that big torque and heavy cars don't mix.

I think you can make it live if you use a spool and billet caps, or better yet, the aluminum pumpkin, but for that money you can build a bullet proof dana.