Uh,...50 Ft Lbs sounds like a bit much for the pinion with no crush sleeve. You may flat spot the bearings. the 'mock-up' pre-assembly to check things out is a good idea, but the pinion needs to be able to turn. This part (well the whole thing actually) is a 'feel thing'. You're in for a suprise with the final assembly on the crush sleeve. The 200 Ft Lbs ain't even gonna move it. You've gotta pull harder than that to get that sleeve to "crush". You have this all well thought out, and again, are obviously not dumb, but this particular repair is more art/feel/experience than theory/measurements/science. I think you'll be alright, just remember....if it feels jacked-up, it probably is. It should feel similar to how it was before you took it apart, only a little tighter. ....You are gonna freak-out on the force required to sqeeze that crush sleeve!