That could be very possible, it's not the stock yoke, I upgraded to a 1350 series cv shaft on the truck, so I'm running an aftermarket 1350 series yoke on the 8 3/4.
It is a very small amount of oil, at first I thought it was some grease that had gotten warm and melted, but when I smelled it I knew it was gear oil.
I also have it a little over filled because I had to rotate the axle up using some Steele shims to point the pinion up towards the t-case since I'm running the cv shaft.