Quote:
Originally Posted by Tpawlik
I recently replaced the all four subframe mounts, all three diff. bushings, shocks, rear diff. fluid and sway bar links. Car handles great now. However, It sounds like I am being chased by a freight train. It sounds like harmonic noise. It is so loud it drowns out the radio. It is not as loud when I let off the accelerator and it starts to go away above 80 MPH. The only thing I see from the shop manual pics. that I did not do right was the shim on the front diff mount. It is supposed to be between the diff and the bottom of the two piece bushing. I have it on top of the subframe under the top bushing.
I am going to move it tonight.
Could this one piece being out of place be transmitting all this noise through the subframe and body?
|
After doing the things suggested and before replacing parts, try to ascertain the condition of the rear wheel bearings. You can do a visual with the usual prying and prodding and you can maybe learn something driving it. Does the roaring seem speed dependent? Find a shopping mall, warehouse or similar building where you can drive along for a distance with the window open listening. You can often hear "bad" sounds as the bounce off the wall you're driving parallel to. In a large empty parking lot you can also try "loading the rear bearings by driving in large circular arcs, which will load the outer wheel's bearing and possibly cause it to announce its impending failure.
A failing bearing will often time "roar" at speed and will vary in intensity at certain speeds. They are kind of hard to diagnose without obvious failure and without taking things apart some.