It's because my car started whining after I took it to the drag strip. No wheel hop, just hard launches - well...as hard as a stock 6R80 will allow.
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Whine / Howl Coming from the Rear End Area at High Speeds
- Thread starterMassimo
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Dave_W
Cones - not just for ice cream
Check the driveshaft center bearing and its housing for play.
Going from rubber bushings to poly for the trailing/control arms (especially the upper) will naturally transmit more vibration into the bodyshell, creating more NVH. If you still have the stock lower arms, maybe try swapping them back on for a quick test to see how much the noise changes with the stock rubber bushings. I'd expect the upper arm bushings to make the biggest difference, as the UCA is connected directly to the diff housing and will pick up much more of the natural gear whine - that will get damped some by the axle tubes by the time it gets to the lower arms.
Going from rubber bushings to poly for the trailing/control arms (especially the upper) will naturally transmit more vibration into the bodyshell, creating more NVH. If you still have the stock lower arms, maybe try swapping them back on for a quick test to see how much the noise changes with the stock rubber bushings. I'd expect the upper arm bushings to make the biggest difference, as the UCA is connected directly to the diff housing and will pick up much more of the natural gear whine - that will get damped some by the axle tubes by the time it gets to the lower arms.
Thanks for the input. I did expect some, just not this much. Stock components I would get a light whine after 60 but now it’s bad enough I almost want ear plugs on the highway. Other than that, I don’t mind it much, I can get used to it talking to me really, but the vibration is more of a concern. Some forums say these are noisy, some say if properly set up they should be quiet, so I don’t know who to believe haha. I believe the shop that specializes in rear ends did a quality job, at least better than would be expected from the average shop. I’ll check in to the driveshaft bearing more. I’ll say, they did initially take out the 2 spacers that go between the center bearing and body but I reinstalled those after noticing the vibration. I hoped that was the vibration issue but it doesn’t seem to be, unfortunately.
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