2001 xterra 5 spd 4x4 was not working and the shop put a new pass side auto hub. now when I start off in the morning it squeals somthing awful and then clunks at about 35mph by the first mile driven and then the rest of the day it seems ok except for a rattle type noise. the shop has replaced the hub once and the same thing is still going on. the mechanic has basically given up. HELP !!!!