Little rear end help please

[rblong]

I tracked my car (road course) this weekend for the first time. After the last session I noticed when I came back and was reloading on the trailer that there was some oil dripping from the rear of the car. There was some water on the course so it looked like a lot of water/oil. I thought well damn - I must have blew something. I got home and unloaded it and put up on the lift. The only oil was on the pessenger side of the rear end - from the axle back. I thought oh well I blew a seal out of the drivers side. I just pulled and the brake and associated components are dry so it is not the seal. I also noticed the vent tube for the rearend is on that side. I have been running this rear for 7000 miles and have never lost a drop of gear grease, but then I am street driving and not hitting corners at 60+ either. It is a 9 inch ford with Currie guts/axles. The vent port is a nipple about 1 inch long. The whole area of the axle/shock etc from the center section to the driver wheel is wet, but past the wheel inside the hub it is dry - so it is not the seal. The rearend grease is low. You ever heard of this? Any help here.

Thanks in advance
Bruce