Just to drive it home I'll say it again, if you put a bolt in tighten it to spec. Do this with every bolt or nut, even if you know that it has to come out later. If you put in a bolt and then it's lunch time or a honey-do deadline is near, either take the bolt back out or tighten it before you go off to do whatever.
Something that GM learned the hard way on the Square Body 4x trucks is that short bolts like those mounting the steering box don't elastically stretch very much before they fail. Anyone who has ever pulled one of those steering boxes has probably wondered why the bolts were so long and then they had spacers in there, and likely figured some idiot lost the original bolts.
Within reason you probably can't buy a bolt that is strong enough if you start failing those short bolts. What you can do, and is what GM did, is use a longer bolt with a spacer to make up the difference in the length. Longer bolts elastically stretch further before failing.