ANDYS87

I have a Ford racing rear end girdle/cover on my 99 GT. Last time I changed the gear oil, I used the stock fill hole and added a little over 2 quarts before it started to come out(if I remember correctly). This time, I decided to save the mess(the factory fill plug is in a bad spot) and use the fill hole on the girdle. Here is the problem....I added 3 quarts, and it still wasn't coming out....so I added about 3/4 of another quart, and still not full! I then realized(duh) that the factory fill hole is way lower than the one on the ford racing cover. I didn't feel right about having that much in there, so i took out the 3/4 of a quart that I added. So, my rear end now has about 3 full quarts of gear oil in it. Is this still too much?????? I took for a test drive and it feels fine...also no leaks. Not leaking out of vent either. Just wondering if I still over filled it....also wondering why the ford cover has a fill hole so high up compared to the stock one. Thanks