Im trying to do some work to my car, i did driver tie rod, driver cv, and front struts..its onto the rear end time, rear sway bar ends, trailing arms, rear driver hub, and struts..

My question is, i got off work, got the car on jack stands, jacked her up, i got the 4 10mm bolts off the hub, but it doesnt want to pop off. Is there any way to get it off? I tried hitting the old hub with a hammer, but it didnt move.