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Put the hub/rotor assembly on. Put the first spindle nut on. it will have a little nub on 1 side which points away from the truck. Tighten to 90 lbs while spinning the rotor to seat the bearing. Once seated, back the nut off 1/4 turn and then retorque to 25 lbs. Put the lockwasher on making sure the nub of the that first nut goes fulling into one the the washers many holes. It helps it wipe the grease awya from the nub to see it and the nut might needto slightly be turned to align with the washer. After the washer is in put the second spindle nut on (it wont have the nub like the first nut) and torque it to about 150 lbs.
The idea is that the first nut pets the preload of the wheel bearings. The washer holds the nut in place by locking with the nub of the nut and the notch in the spindle. the third nut just acts to lock the washer and other nut in place.
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