It's the PRELOAD that has to be in spec, not the torque. That is, holding the yoke from turning, you tighten the nut a bit, then let go of the yoke and check how many inch-pounds it takes to turn the pinion. The catch is that it takes around 300 ft-lbs to tighten the nut (because you're crushing the sleeve), yet preload is measured in inch-pounds. A sixteenth of a turn will take you from too loose to too tight. Too little preload and the pinion bearings will be loose once they break in. Too much preload and the bearings will fail.
Howling is typically caused by loose pinion bearings, although it can be because the backlash and/or pinion depth wasn't set up properly.
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