question bout 8 3/4 oil seals

The rubber seal goes towards the outside. I usually use a hammer on a socket with an extension or a pipe that has the same outside diameter as the metal outside diameter of the seal. Make sure you get them beat all the way in. Make sure to lube the seals as well prior to installation. Before slipping the axles in, slide an empty toilet paper roll split down the side into the seal. Once you get the splines past the seal, you can then remove the roll. Make sure to lube the axle bearings as well; they make a needle that slides into a grease gun for making it easy.