Whenever I shift into 4 wheel drive, whether it be low or hi, I get a strong thud seemingly every time the wheels make a full rotation. It sound like it's coming from the back and it's a loud thud. It even shakes the truck the slightest bit.

Has anyone ran into this problem? Also, since day one, when I take off from a stop i get a clunking when i take off. It's not as loud or strong as the 4 wheel drive clunk, but it's more rapid almost like a mounted machine gun speed.