mammoth200 Posted June 6, 2017 Share Posted June 6, 2017 Evening folks, just after some advice. My 07 zed has done a little over 86k miles. In the last month or so, I've noticed a noise which seems to be coming from the rear of the car. It becomes apparent from about 40mph in 3rd gear, it's a low hum that gets louder as the speed increases. I've been changing all fluids as I go, and at the weekend I changed the oil in the diff. I was hoping this might either quiet, or get rid of the noise entirely, but no luck. The oil that came out was darker, but clean and no shiny bits, so I'm unsure if the noise is coming from the diff. I'm more familiar with wheel bearing noises, and I'm not getting any change in noise when turning. Any ideas? No noticeable noise under 35mph, is it likely to be a bearing or something inside the diff making the noise? Is there a chance I'm completely off base and it's the gearbox? Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted June 6, 2017 Share Posted June 6, 2017 May be a rear hub bearing. Jack it up and check for play etc. 1 Quote Link to comment Share on other sites More sharing options...
mammoth200 Posted June 6, 2017 Author Share Posted June 6, 2017 Thanks chap, will do. Do you have any wheel bearings if it turns out I have in issue? Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted June 6, 2017 Share Posted June 6, 2017 Yes, in stock, just drop me a PM if I can help further. 1 Quote Link to comment Share on other sites More sharing options...
Dal B Posted June 8, 2017 Share Posted June 8, 2017 Have a quick check of your tyres too dude, could be slightly stepped which can cause a noise similar to what you're describing 1 Quote Link to comment Share on other sites More sharing options...
Jay84 Posted June 8, 2017 Share Posted June 8, 2017 +1 on tyre stepping/flat spots. 1 Quote Link to comment Share on other sites More sharing options...
mammoth200 Posted June 8, 2017 Author Share Posted June 8, 2017 Thanks for the suggestion. I've just taken a look, the nearside front tyre seems to be wearing more on the outer edge, though not excessively. Is that most likely to be alignment or camber etc? Quote Link to comment Share on other sites More sharing options...
Jay84 Posted June 8, 2017 Share Posted June 8, 2017 Try rubbing your hand over the tread blocks too, there is a marked difference between normal and stepped, and tyres that are stepped rumble a lot. Any other car I'd suggest swapping your front and rears and see if it changes where the noise comes from. Quote Link to comment Share on other sites More sharing options...
Jay84 Posted June 8, 2017 Share Posted June 8, 2017 Thanks for the suggestion. I've just taken a look, the nearside front tyre seems to be wearing more on the outer edge, though not excessively. Is that most likely to be alignment or camber etc? Could be fast cornering or tyre pressures too. You should see the tyres on works car Quote Link to comment Share on other sites More sharing options...
mammoth200 Posted June 8, 2017 Author Share Posted June 8, 2017 Try rubbing your hand over the tread blocks too, there is a marked difference between normal and stepped, and tyres that are stepped rumble a lot. Any other car I'd suggest swapping your front and rears and see if it changes where the noise comes from. Yeah that's exactly what I did, I've taken an image of the edge in question, I don't know if you can see it? The tread blocks are definitely sharper on the front edge than the rear, even in comparison to the inside of the tyre. Quote Link to comment Share on other sites More sharing options...
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