vibration at 45 mph
It's probably your CV joints going bad. Years ago, I had a similar problem with a rear wheel drive car and it was the U joints. Take your car in for an inspection, usually free if they just test drive it , and a good mechanic will normally know what this is right away. Good luck. You should not continue driving the car in this condition for very long.
Or your tires need to be balanced
Could be a bad rotor as well. Have a shop check the car before jumping to conclusions. These cars when taken care of can get upwards of 300,000 miles before overhaul. Mine personally is at 276,xxx miles the car is quiet and everything works still.
Looking for a Used LeSabre in your area?
CarGurus has 1,868 nationwide LeSabre listings starting at $1,588.
Search Buick LeSabre Questions
Buick LeSabre Experts