I own a '99 Concorde with just over 95k miles on it, plus I have frequented several 2nd Gen. LH forums (300M, Intrepid). Not once have I heard of a bad CV joint on one of these cars, though I'm sure it has happened to someone - but at
41k and no torn boot? Very doubtful.Vibration? Could be front wheel bearing - they do go bad (replaced one myself at about 65k).
These cars are also *very* sensitive to tire problems. Rotate the tires around and see if things change at all which may not fix the problem, but may tell you if a tire(s) is(are) the problem.
Did the problem develop since you replaced the tires or was it there before that? What kind of tires do you have on there. Some brands and models work on these cars, many don't (especially of the "high-performance" type).
But that's my guess - either a wheel bearing or a tire issue. You might also consider warped front brake rotors. It would be worth ten minutes of your time to check that the lug nuts are properly torqued - i.e., not overtorqued (or there may be permanent warpage - that is also common, but it generally doesn't cause vibration until brakes are applied).
Bill Putney (to reply by e-mail, replace the last letter of the alphabet in my address with "x")