Mine was a mess always, regardless of parts, until my alignment shop gave the car maximum positive caster. Stopped following ruts immediately, and i had driven the car like that for 8 years.
jack up both sides of the car shake the wheels and check for any play. No play/ inspect tires for unusual wear on the inner or outer side of tire, i would take it to a mechanic w/ an alignment machine. If nothing helps and theirs play in the wheel i'd say steering box isnt doing its job. Maybe your due for a power steering flush. but if its a drifter when the wheels straight. the toes off
Yup...i agree with 2000xp8. Last time i had my car aligned was after installed MM CC plates. I had them dial in as much positive caster as possible. The car drives like a dream on the highway...and does not follow ANY ruts.