I just wanted to re-grease the wheel bearings after doing the brake shoes. Thank you for the nice comment.

At 3:25 I install a wheel seal, that wheel seal keeps gear oil out.

@@gpadrov2 If it is a full floating axel, and it looks like it is, gear oil from the differential flows through the axel tube into the hub to lubricate the wheel bearings. Oil is prevented from escaping the hub by the inner oil seal on one end and the axle flange gasket on the other. As you can see in the video, the inner seal keeps oil from contaminating the brake linings. Some use an assembly grease or lubricant for initial bearing installation and the grease is later dissolved into the oil. But it is not mandatory to pre-lube the bearings with grease. However, you are correct in the method of repacking a wheel bearing that requires bearing grease. Just apply a liberal amount of gear oil to the bearings and assemble. Upon completion, jack up one side of the truck at the rear and then the other to let oil flow through the axel tube to the wheel hub. Lower the truck and let everything settle and check the differential fluid level. Add gear oil as necessary. Judging by the video that no oil came out upon removal of the axel and your bearings looked a bit dry, your differential fluid level may be low.