I have a 1997 Lincoln Town Car [Cartier Series].
It has always leaned to one side (passenger side). This, however, has
never impacted drivability.
What would be some reasons why a big, body-on-frame sedan would lean
Leaf spring is only plausible answer to me.
If it were a front spring, there'd be a drivability problem and I'd
have heard a noise at
some point. The car is quiet and still exhibits a smooth ride.