Right hand thread/left hand thread 68 charger????, pressed on drums?????help!!!!!!

As for the stuck cragar. I simply clamped some vice grips, and wedged it between the wheel, but with a rag on one side, to avoid scratching the rim. I then took a strong power drill. And used a few drill bits, starting out small, and then on to some the size of the stud. I drilled all the way through it, and kept going til it eventually broke.(i drilled through both the stud, and covered lugnut)..then i found out it was threaded the other way around. It was pretty easy, and it only took awhile. That drum was the same, hard as hell. Hammers, crowbars, and lots of wd-40. It came off the same way, and i still cant figure out why it would be so damn hard for drums to slide off??? Anyone know, if so please tell me, im dying on trying to figure out why, the only thing i can think of is the small indent all around the axle. Thanks guys