Can any one please help me I I own a 2002/f150 xtr with 65000km .I recently hauled about 700/lbs of bricks home from work one day I got home and unloaded them and noticed a knocking noise from my rear differential . I jacked it up and rotated the wheels but it seems to be weight bearing only. It only happens at low speeds and occasionally but drives great after 20km/h (canadian eh) usually after turning. It has the lim slip. I'm hoping it's just a bearing in the diff could any on please help it's getting louder