140's tend to devour caster bushings at a alarming rate.
These are the rearward bushings in the lower a-arms. They will cause the car to wander a bit, follow the grooves in roads, vibrate some and the feedback from small harsh bumps feels excessive.
These really are a simple replacement provided the car is not real rusty just be sure to have it followed by a good 4 wheel alignment.
Project Smoker, '87 603 powered wagon
Hauler, 96 CTD can you say torque?
Toy 73 Cougar xr7 convertible
Acme Automotive Inc.