Yoke seal leak on 741 posi fixable?

So why does the factory service manual say to set the preload by torquing to 240 ftlb? The shims set the pinon depth. The factory manual as in by the people that designed this. Your saying that the they are wrong? Sorry I'll believe them over you, nothing personal. I've torqued them to 240 for 40 years and never come close to stripping one.