So I have been having some troubles when I'm offroading. When I engage 4 wheel drive I hear this loud clicking/griding noise coming from my driver side axle. Took a look and the U-Joint is extermely loose. Deciced to swap it. Took of the wheel, caliper, and rotor. But when I got to the hub and dust plate, I couldnt get the axle shaft to pull out. I looked it up on the internet and did exactly what it said. Even smacked it a few times. but nothing. any ideas what it could be?