The only good thing about that guys situation is that he has an automatic, which is more gently on drivetrain components.
But come awn, his cases have been in and out of three different rigs, he has a freak'n Chevy 406 V8 with one ton axles and "big swampers". Are you going to try to tell me that his input shaft has not had a hard life?
That is crazy and very uncommon. It is much much more common to break a output shaft behind a 5.19:1 (double low range) ratio than it is to break a 21-spline input behind 2.28:1 (Crawl Box in LOW) ratio. I am not even talking about twentyfootdaredevil's 4.70:1 input, which is much stronger than a stock 1981+ 21-spline input.
Its a good story but everything will eventually fail, right?
twentyfootdaredevil and everyone else should feel perfectly confident with using their vehicles with the Crawl Box in Low and the T/case in High.
BigMike