First thing you need to check is the toe-in front and rear, wheels should be toe'd in about 3/4 inch. the attached chart will help you determine if you have a toe-out problem with the rear wheels and which wheel it is, if you do find that you have a problem with one wheel toe'd out there is a shim kit available to set the toe-in.

Chart for Checking Toe In.doc (33KB - 190 downloads)