[DirtyLarry]

That's not really that uncommon of Saginaw p/s pump failure. Years ago when working at my dad’s shop I remember changing a few Saginaw pumps like that where the pump shaft broke and the belt was the only thing holding the shaft in the pump. I’ve also seen brand new trucks with Saginaw pumps that did the same thing under warranty. That is not to say Saginaw pumps are no good, because they is not the case. Saginaw pumps are actually be best ones ever used but they can break too. Heck, in recent history I've seen brand new ZF power steering pumps on medium duty trucks my company builds break in the same fashion and it makes for one hell of a mess too. Poop happens.

P/S fluid with water contamination that has frozen is the most common cause for shaft breakage. FWIW, old Saginaw pumps work best with ATF apposed to actual power steering fluid. If you used the dime store parts store powersteering fluid as well could have caused this if the truck sat out and froze. Cheap P/S fluid can be just as bad as contaminated good ATF. I've seen a few P/S cooler lines blow off due to cheap P/S fluid freezing. The line blows off if your lucky, if your not lucky....the pump can break. Not all pump failures can be attributed to fluid but a great deal of them certainly are.

I wouldn’t be worried about “Hencho en Mexico” parts though. Typically, Mexico quality is on par with Canada and USA. It’s the Chinese, Taiwanese, Indian and Eastern European parts you should avoid.