Loctite was used on the pinion nut before it was installed. Before it sets up, the required rotational force is measured with a torque wrench calibrated in inch-pounds. The desired force is 20-22 in-lb, which will be shown on the dial when the pinion is rotated using the tool. Our first reading came in at 16 in-lb, so the pinion nut was tightened down a little more for a final reading of 20 in-lb. Be careful not to overtighten the pinion nut to begin with because the crush collar will be too small if the assembly has to be loosened because of a reading that's too high.