aFe Power 46-70162, Instruction Manual, Page: 10 / 16

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13.
Fill the differential with gear oil until the oil runs out of the 1/8" NPT hole in
the front of the differential cover.
*If your axle is rotated different from stock, the 1/8" NPT will not be the full mark.
Please fill to the correct level before driving.
*Install Teflon tape on 1/8" NPT plug and magnetic fill plug
14.
Using a 3/16" allen wrench, install the 1/8" NPT plug in the front of the
differential cover (as seen in top picture) and tighten.
15. Using a 1/2" drive extension, install the magnetic fill plug in the top of the
differential cover (as seen in bottom picture) and tighten.