datzun240 Posted March 9, 2006 Share Posted March 9, 2006 Today i tried to figure out where the sounds were coming from in the rear. Below is what I did in order to try to narrow down what it was: I first removed the halfshaft from each side so that I could isolate the wheel bearings as a possible cause of the sound. On the driver side i could spin the hub w/o any problem, but there was a metallic drag sound coming from it (i had the drum off of course). It was a metal on metal sound, but it wasn't dragging. On the passenger side, it was more difficult to spin the hub, but there was no sound coming from it @ all. I put everything back together and then put the tires back on. I forgot to mention that prior to this I made sure all my u joints were cool from the driveshaft all the way back the diff. I also checked my fluid lvl in the differential. Next I had the rear end up in the air and had my helper get the rear tires moving from inside the car by going through a few gears. The first thing i noticed right off the bat was that the driver side tire was wobbling like no other (side that is easier to spin, but making metallic drag sound). However, i failed to recreate the sound that im hearing in the car. I did that a few times and then made sure the wheel was torque'd down properly and then went to have that one tire checked for balancing issues. Everything checked out. When i took the car out for another drive after I checked everything, have narrowed the sound to be coming on about 30-40mph and it doesn't matter what gear I'm in. Progressively gets louder as the speed increases and the sound decreases as the car is on decel. The only conclusion I have come to is that my wheel bearings on the driverside maybe shot, but as it will take a few days to get the parts, I will have to wait. But I was wondering if a worn wheel bearing make it easier or harder to turn the hub? Because as I stated above, the side that was easier to spin was making the noise and the harder one to spin was making no noise @ all. Just wondering what people thought of this, and hoped someone would chime in w/ their own personal experience, not the "my brother's friend's grandfather's car... " story. But Thanks in advance for reading the long post and hope to hear from anyone. 72 240z r200 diff w/ urethane on mustache bar Quote Link to comment Share on other sites More sharing options...
Phantom Posted March 9, 2006 Share Posted March 9, 2006 Put the car into a corner and see if that affects the sound. My experience with rear wheel bearings going out was that they made noise in a straight line but got much quieter in a turn. Quote Link to comment Share on other sites More sharing options...
datzun240 Posted March 10, 2006 Author Share Posted March 10, 2006 Yea, they would be quieter in some corners depending on which side went bad b/c the load on them would be different. I was thinking about why one side would be easier to spin possibly b/c one side is greased still (the quiet side) and the other side is bone dry, so its just metal on metal w/ less friction so it would spin a lot easier than the one packed w/ grease. Still trying to figure out whats going on. thanks for the response though Quote Link to comment Share on other sites More sharing options...
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