You unscrew the plug on the front cover, and ad 75w90 to the bottom of the hole.
Just fill it until the lube runs out the fill hole. It is now full.
It is in the center of the differential cover.
To add front differential fluid to a Suzuki King Quad 300, locate the front differential housing, which is typically situated near the front axle. Remove the fill plug, usually found on the top or side of the differential case. Use a funnel to pour the appropriate type of differential fluid into the housing until it reaches the fill level, then securely replace the fill plug. Always refer to the owner's manual for specific fluid specifications and maintenance recommendations.
It is a rubber plug in the front cover.
Driver's side of differntial, mid-way up case. You'll see a pipe threaded plug.
There is a plug on the front of the case. Usually a 3/8" square socket plug. Could be dirty enough not to see. Keep looking!
Through the check plug hole in the rear of the cover.
On the front, about 3" up. On mine it was a 24mm nut.
Usually you fill it to the bottom of the hole.
there is a drain (on the bottom) and fill plug (toward the top) for the front differential. 1.6 quarts of 75W90 GL-4 or GL5 gear oil.
To change the oil in the front differential of a Nissan Armada, first, ensure the vehicle is on a level surface and safely lifted. Remove the fill plug and the drain plug using the appropriate tools, allowing the old differential fluid to drain completely. Clean the drain plug and replace the gasket if necessary before reinstalling it. Finally, fill the differential with the recommended oil through the fill hole until it reaches the proper level, then replace the fill plug securely.
Remove the fill plug from the 2001 Explorer differential. Remove the cover from the head to allow the fluid to drain. put the cover back on with a new gasket, then fill the unit up through the fill hole.