Rear axle seal leak

[Vanspeed]

Hi guys,

I am putting together a 1953 F-100 with a 1964 F-100 9 inch rear axle. I was working on the passenger side fender today so I had the truck jacked up on that side. When I was done I noticed rear axle lube coming down the driver side rear tire. This truck is not on the road yet so this is not something that needs to be fixed right away but what am I looking at here? Never replaced seals in a 9 inch before. How many seals does this rear have? Do I have to take the whole axle apart? Thanks.