I have a new to me 04 LS430 with 53K on it, at freeway speed 60-75 MPH there is a slight moaning sound and goes away on long sweeping curves then comes back on the straight.
It does not appear to be RPM related but speed related, Wheel bearing?: The car has been
Lexus dealership maintained up to 49K, looked it up by VIN on Lexus web site, any thoughts?
Tom

 

My dog has her head on my knee and is making that same moaning noise as I eat lasagna that my daughter made. I'm typing instead of giving some to the dog.

Welcome! I'm the designated smart-aleck moderator (as opposed to those moderators who can probably actually answer your question).

 

Too young and few miles to be bearings (at least for Lexus, maybe not for Chrysler) so I would say tires are the culprit. check for alignment and tire wear.

 

If that's not it, check the trunk, maybe this was former hitman vehicle...

 

It would likely be some front end, suspension, or brakes, tires, wheels component given that's where most of the load and force vector changes occur when changing direction.

First thing I would do is check for uneven wear and alignment problem as previously posted, also have tires rebalanced and rotated and see if noise changes.

It could be a wheel bearing if the car has ever had any significant impact to a wheel potentially damaging the bearing.

 

Thank you for the quick input, I will be going to Pacific Tire this week to have the tire and wheels
checked for true and balance. I will let you know how it turns out...
Fresh Amsoil 5w-30 signature series and Ea filter after visit to the tire shop then a long test drive
in the nicest car I have ever owned... Tom

 

Check the tie rods. My bro had this problem, and even though th car was technically in alignment, the tie rods were adjusted very unevenly. One was almost fully "unscrewed" and the other "screwed in" too much. In a long sweeping curve it would cause a misalignment and subsequent tire noise. Dealer had done the alignments improperly, he had an indie shop diagnose and fix it, requiring the steering wheel to be removed. Kind of a complex job, but got it solved.