drivetrain

What is your question?

1999 expedition 4wd 5.4 triton when turning the front end feels like it is going to fall out from under the truck, heard that this is a common prob coming from the rear end and not letting the rear wheels turn normally,which is basically just plowing the front end around corners heard there was a "service pack" that can be purchased for the rear end to fix this does anybody have any ideas of onfo on this subject