The outer tie rod ends on the steering linkage may wear causing excessive free play in the steering and uneven tire wear. If the worn tie rod ends are replaced, the wheel alignment should be checked and adjusted as necessary.Google+
Car Problem Reports
Buick Park Avenue Wear in Outer Tie Rod Ends Can Cause Steering Problems
Buick Park Avenue Problem
Average Mileage: 93,250 mi (70,000 mi - 130,000 mi)
Visitor, 2004 Buick Park Avenue, 75,000 mi
Outer tie rods worn out. Replaced
Car started bouncing going over 45mph, outter pass side tie rod broken, replaced.
Visitor, 2002 Buick Park Avenue, 70,000 mi
Tie rod end on driver side so worn out it won't tighten. Constant vibration. Needs replacement.