The reason I asked about the axle seals is you are supposed to run them with the green bearings. The green bearings are a sealed bearing that contain their own grease, it is possible for the gear oil to wash the bearings out if the seals are not in place, at least that is what I was told.

As far as the suregrip lube is concerned. Like pacnorthcuda said if it fits, it doesn't need to be drained at all. Also you can jack up the right side of the axle so it is leaning a little bit to the left to give you a little extra room. or vice versa, I am trying to remember which side the fill plug is on. Use jack stands and be safe.

Jeff