Hi,I have a 2002 ford explorer xlt v6, my wife was driving full speed on the highway with 4wd on, and she turn it off while she was on full speed, since the 4wd work but it make a loud noise and vibrate throughout the car,the abs light is on,and I can't switch the 4wd on low ,only on high with a lot of noise, what could it be dry transfer case, bad front diff, and I have a mechanic scan the car , the abs pump is not working.