Front Axle Seals?

[gator2511]

My truck is a 72 Chevy 1/2 ton shortbed 4x4. The front end is a chevy 10 bolt. I just pulled the axles out of the front end and put new u joints in them. When I was putting it back together I noticed I never had any seal where the axle goes into the diff. housing tube. I know there are seals farther in the tube near the pumpkin but should there be one on the outside also? It seems like it should have one and I don't want to go near the water till I'm sure.