Hey gang. I hope some of you veterans can help me out.
Its a 2004 LeSabre Custom, with the NA 3.8L. 116k miles.
I know noise diagnosis is tough over internet, but I'm looking for areas to check.
Its a really bad buzz coming through the front end.
I can feel it in the steering wheel.
Its gotten progressively worse in the last day.
No ABS lights on.
It matches road speed exactly, engine rpm does not affect it at all. It actually sounds a lot like supercharger whine, or a small block gear drive setup, but varying with road speed instead of engine speed, and you can really feel it.
Applying brakes does nothing to change the sound at all.
It doesn't appear that I can "load" the bearings, in other words, turning either direction doesn't seem to make the noise any worse left or right.
Its not a pulsation, shimmy, shake, or repetitive vibration. Its just a constant whine.
Going through the full range of gears manually does not affect the sound.
I've rotated the tires front to back, no change. I've checked for play in the bearings, nothing. I've checked for play in axles, nothing. Checked all 4 tires for signs of tread separation. Nothing, not a crack, blister, bump. Checked caliper to disc clearance. Fine.
What am I missing? 2 days ago, it was fine. Yesterday it started on the way into work, but not bad. On the way home, it drowned out my radio. Kinda hate to ask, but what are the chances my trans is screwed? It has fluid. It was flushed about 2 months ago, shifts fine, no slip.
I've had automatics die before, but they usually start to slip, or loose a gear. Blew up 3 in my turbo Regal alone.
Something I'm overlooking? Any ideas? If it is the trans, its still under the car dealer'* warranty with $100 deductible.
I've blown up every automatic I've ever owned, with exception of the TH400 in my 73 Electra. :(
What I have done recently:
New front pads and rotors. Wheel lugs were torqued to spec (i.e. not buzzed on with an impact). All brake components were torqued to spec and not buzzed back on with an impact. (Only used impact for disassemble.)
Trans was flushed about 2 months ago.
Had tires balanced and rotated about 3 weeks ago.