Ford 3L8Z-4N046-AA Seal Assembly - Oil

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Loosen the wheel lug nuts. Raise the rear of the vehicle and support it securely on jack stands. Block the opposite set of wheels to keep the vehicle from rolling off the stands. Remove the wheels. Disconnect the driveshaft from the differential companion flange and fasten it out of the way. Mark the relationship of the pinion flange to the shaft, then count and write down the number of exposed threads on the shaft. A flange holding tool will be required to keep the companion flange from moving while the self-locking pinion nut is loosened. A chain wrench will also work. Remove the pinion nut. Withdraw the flange. It may be necessary to use a two-jaw puller engaged behind the flange to draw it off. Do not attempt to pry or hammer behind the flange or hammer on the end of the pinion shaft. Pry out the old seal and discard it. Inspect the seal bore to ensure it is clean and smooth. Lubricate the lips of the new seal and fill the space between the seal lips with wheel bearing grease, then tap It evenly into position with a seal installation tool or a large socket. Make sure it enters the housing squarely and is tapped in to its full depth. Install the pinion flange, lining up the marks made. If necessary, tighten the pinion nut to draw the flange into place. Do not try to hammer the flange into position. Install a new pinion nut, then tighten it to the torque. The remainder of installation is the reverse of removal.

Install the pinion flange while lining up the marks made earlier. If necessary, tighten the pinion nut to draw the flange into place. Do not attempt to hammer the flange into position.