Hello,

Please can you help me identify a noise coming from the rear of my 2007 Manual.
The video demonstrates the noise, firstly outside, then when it goes dark my phone is inside the car. The squeaking is from the 'self-lubricating' delrin bushes.

In brief:
-It started making the noise perhaps 18 months ago, but is getting worse.
-Hard to locate, it won't make a peep on my ramp, either spinning wheels/engine by hand, or when the engine is running. Strongly suspect it is from the rear of the car.
-Most noticeable at low speeds when turning and off power, but it will make the noise in a straight line and on power too.
-It's the stock diff housing, with some Z06 parts for strength (RPM rebuild in 2016). A shorter ratio Motive Gear 4.1 crown and pinion were fitted over 2 years ago. I changed the diff clutch packs (from Racing Diffs.com) a few months back as the stock ones had worn out and it was no longer acting as a limited slip diff. I inspected the internals as best I could, no rub marks and no particles in the oil or on the magnet.
-I currently have the transmission out to find this, so the gearbox, diff, torque tube, prop shaft (I changed the bearings and 'guibo's 2 years ago as a precaution) and more are out and I can see no issues.
-The axle shafts feel smooth enough, all four cv joints feel the same.
-Hub nuts are correctly torqued and the spline into the hubs are greased.
-Tyres aren't rubbing, not are the discs/handbrake shoes, that I can see anyway.
-I changed the diff oil again as a precaution a few months back, to the correct GM fluid with friction modifier (AC Delco).
-Only issue I can find is a tiny amount of play on the left rear wheel bearing. It's a little rough and I'll change it.

I think that's it, any ideas before I have to strip the diff or gearbox, or start randomly replacing parts?

Thanks in advance, Dave

 

Low speeds and still runs rules out half shafts, i would guess it to be your wheel bearing needs replaced.

Just curious as you are more of a mechanic than me but why would you have not replaced or tested the wheel bearing before ripping everything else apart?

Just trying to understand, it makes the noise even with out rolling?

 

Thanks for replying. A good point, I should have replaced the bearing, however, the movement is so slight I can't believe it's responsible for the noise.
It only makes the noise whilst driving, most noticeably when turning at slow speeds. It doesn't make the noise when the car is suspended in the air on my lift, presumably because a. it's not under load or b. it's not turning a corner (diff related).
Still not sure what to do as my next step.

 

lol ok then switch bearings from side to side =)

https://www.corvetteforum.com/how-to...eel-hub-368660