Hi my ls400 has put me in limbo for 5 months, some days i get this creaking noise and some days i dont it all started after i changed my front brake pads ever since had this noise.bought a fairly used upper control arm ,the noise got louder. in april i drove to finland about 1300 miles,still had noise when under 40mph, help.
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Re: my 96 ls400 suspension noise
Front lower ball joints are possible cause, they wear out and start all kinds of noises, uppers are also suspect, either the ball joint or the control arm bushings. Did you put the anti squeek shims behind the pads?
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Also possibly a slightly stuck brake caliper, or on a long shot, a CV joint. But the CV joint would be more likely if it was making noise when turning. Could also be a spring/strut/sway bar or other suspension component in need of lubrication, depending on how long the creaking lasts, etc.
My wife drives a 2003 GMC Envoy and has been complaining about this same creaking noise upon breaking or going over speed humps. I researched this topic on the internet high and low and tried everything I read to no avail. I was about to give up and then realized it could be the motor mounts since when you break or go over bumps the engine does have some movement. Sprayed the most interesting looking motor mounts I've ever seen with silicone spray and the noise was gone! My wife has been complaining for years about this noise and now looking back what a simple solution!. By the way my motor mounts where not worn out, the rubber portion of the mount just needed a little lube.
sounds like a cv axle noise i have found you cant change inner without outer, for the time spent you should replace the axle as a whole,,much easier too. front wheel drive cars are hard on front end bushings and etc. the coil springs seem to sqirm in there saddles when they get old too making creaking noises, no big deal on ford escort, tempo, topaz, sable,,,,,