Lurches after 20-30min driving, worse when brakes applied
When first noticed problem, made a screeching, grinding noise. Changed the front right bearings, brake shoes all around. Continued to make noise, and now suspected transmission, because the lurching was happening more often when brakes were used to slow down. Checked transmission oil pan and LOTS of metal shaving were found attached to he magnet in pan, plus several more loose in bottom of pan. Changed the transmission fluid and have driven approx 40 miles since, with lurching continuing.
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A grinding or rumbling noise can also be symptoms of a wheel bearing or constant velocity joint in a driveshaft. A worn wheel bearing can also cause a 'whistling' sound (as can a worn CV joint).
A grinding noise with brakes is either worn pads causing metal to metal contact on the brake disk/rotor, or the brake backing plate catching on a spinning rotor ... or a loose/missing anti squeal brake shim (they stop the pads from rattling and vibrating).
However, as you say a mechanic has looked at the brakes and can't find anything wrong .. I think I would begin to suspect a wheel bearing or constant velocity joint on the driveshaft (front wheel drive cars).
Is your car a rear wheel drive? If so, the limited slip differential grease is low...if front wheel drive could be right rear strut/shock assembly is totally worn out...wheel bearing maybe, but usually makes a grinding noise...does applying the brakes affect this stuttering? Should be a free inspection at most quality repair shops...good that you notice this before it gets worse...
Without a description of the noise, this is impossible to diagnose. Common problem with these vehicles is a "grinding" type noise. This will be a bearing that has gone bad or brake pads that are beyond the service life (louder screeching or grinding upon braking). Popping noises are the CV drive axles are bad (noise is typically louder when when the vehicle is in motion and turning).
you most likely need to have your front brakes replace post haste. the grinding noise,does it get worse when you apply the brakes? the grinding noise will be a bad brake rotor and will also make you car pull hard one way or other depending on which brake is worse. recommend highly that you have those brakes looked at. the more you drive it, the worse the problem will be.thank you for choosing fixya.com and please rate my solution thank you!
it could be your brakes , on most brakes there is a wear tab that makes a high pitched squeeling noise when it contacts the rotor. this is in place to let you know your brakes are due for replacement. if it is not your brakes then it could be a wheel bearing.
If your C/V joint is going bad it will make a nasty clicking sound and get louder the longer you leave it unattended.If this noise went away it could have been something stuck it the moving area of your wheel and just worked itself out.Keep an ear out for the noise to return,it it dosen't come back be happy.