adwinistrator Posted December 28, 2015 Share Posted December 28, 2015 [ame=www.youtube.com/watch?v=br9iXvEXRkk]Drivetrain noise[/ame] So I had the transmission fluid changed recently, and started hearing some whining noises a few weeks later. Noise is not present when the car is cold, starts after 15-20 minutes of driving.Noise is related to wheel speed, increases in pitch (not volume as much) with speed.Noise doesn't change when clutch is used, gear is changed, or neutral and rolling.Noise does change when I push the shifter into the left or right gate. It does sound like it's another noise being made, but it is a similar noise, higher pitch.Doesn't seem to change whether I'm turning or going straight. My first thought was wheel bearing, but it seems strange to not have that noise when the car is still warming up. There was also a moment about a week ago when there was some sharp scraping noises (same variables, wheel speed related) for about 5 minutes, and then it went away... I'll be getting the wheel bearings checked first, but I'm thinking this could be something like an output shaft bearing. Thoughts? Link to comment Share on other sites More sharing options...
whitetiger Posted December 28, 2015 Share Posted December 28, 2015 my 1st guess would be wheel bearings. if not, you have eliminated everything up to the output shaft of the trans, so it could be an output shaft bearing, drive-shaft, differential, or axle issue, again assuming its not the wheel bearing. Link to comment Share on other sites More sharing options...
adwinistrator Posted December 28, 2015 Author Share Posted December 28, 2015 my 1st guess would be wheel bearings. if not, you have eliminated everything up to the output shaft of the trans, so it could be an output shaft bearing, drive-shaft, differential, or axle issue, again assuming its not the wheel bearing. I just posted a video. I guess the reason I'm guessing it's not wheel bearing, is that it doesn't make noise for the first 15 minutes of driving, and doesn't seem to change much while I'm driving through turns... I know it's a possibility though. Link to comment Share on other sites More sharing options...
whitetiger Posted December 28, 2015 Share Posted December 28, 2015 still could be wheel bearings. im working with a 05lgt that basically does the same thing, regardless of how i load up the suspension. the easiest way to check things is to get the car fully up on 4 jack stands , and put the car in a higher get to get some wheels speed at idle. the go under the car and with a long screw driver, the handle to your ear and the tip to different points on the car, see if you can hear the source of the noise. start at the rear trailing arms when the hub bolts in, then the diff, then the drive-shaft center support, then the trans rear housing. Kinda like a rudimentary stethoscope. Link to comment Share on other sites More sharing options...
adwinistrator Posted December 28, 2015 Author Share Posted December 28, 2015 still could be wheel bearings. im working with a 05lgt that basically does the same thing, regardless of how i load up the suspension. the easiest what to check things is to get the car fully up on 4 jack stands , and put the car in a higher get to get some wheels speed at idle. the go under the car and with a long screw driver, the handle to your ear and the tip to different points on the car, see if you can hear the source of the noise. start at the rear trailing arms when the hub bolts in, then the diff, then the drive-shaft center support, then the trans rear housing. Kinda like a rudimentary stethoscope. That would probably be the best way to find out. I'll probably get it looked at tomorrow, and will ask them to do this (beside the normal wheel flex tests). Link to comment Share on other sites More sharing options...
whitetiger Posted December 28, 2015 Share Posted December 28, 2015 Bad bearings on these cars will generally pass the wheel flex test unless they are really about to fail. Link to comment Share on other sites More sharing options...
adwinistrator Posted December 28, 2015 Author Share Posted December 28, 2015 Bad bearings on these cars will generally pass the wheel flex test unless they are really about to fail. Good to know, thanks! Link to comment Share on other sites More sharing options...
adwinistrator Posted December 31, 2015 Author Share Posted December 31, 2015 Turns out it's a bearing in the center differential, one that leads to the driveshaft. I'll start a new thread looking for input on my options. Link to comment Share on other sites More sharing options...
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