How do you change gear oil chev s-10?

To change the gear oil in a Chevy S-10, first, ensure the vehicle is on a level surface and secure it with jack stands. Remove the drain plug from the differential and allow the old oil to completely drain out. Once drained, replace the drain plug, then remove the fill plug and use a pump to fill the differential with new gear oil until it reaches the fill hole. Finally, replace the fill plug and clean up any spills.