Weird Noise 2005 Mustang GT

[davedansky]

Hi, looking for a bit of advice. Two weeks ago I had the passenger side axle shaft replaced due to a buckled hub, also the rear discs and pads. Job went well, I picked it up and drove off happy, after about 10 miles whenever I turned the car left or right there was what I could best describe as a loud creaking noise from the rear which stopped as soon as the car straightened up. I took it back to the garage the next day, at first no noise but again after it had warmed up same again only when turning. We took it a test drive, the mechanic was convinced it was the LSD and said maybe the oil he put in was too thin when warm so he'd replace it with more viscous oil. This hasn't helped, still making this creaking almost grinding noise when turning after it has driven at least 5 miles. I'm also convinced I can feel a very soft but noticeable feedback like a vibration through whichever pedal my foot is on when going very slowly like turning into or out of the drive, I think I also felt it through the steering wheel. I might be overly sensitive to everything on it at the moment so might be imagining this, but certainly not imagining the noise. The garage is now suggesting the diff might be causing the problem, it was OK before the axle shaft was replaced. Anyone got any possible suggestions before I seek out a diff specialist?

Thanks.

Dave

[Janosh]

It sounds like it could be coming from the diff, first port of call would be to ensure you have fluids known to work in your application.

I use this in my S550:

[davedansky]

Hi have put my trust in the mechanic, he said he looked up my car specifically and there were 3 diff oils for it. Originally he put the least viscous one in, now it has the most viscous. When he changed them he said he checked in the diff for any sign of particles present in the oil that could suggest grinding but there were none.

[Janosh]

Find out exactly what oil he’s put in and work it out from there..

Particles and viscosity aren’t necessarily the full story, it’s more about the friction modifier.

A few years ago I had a diff rebuilt by a reputable specialist. I told them the exact spec of oil that was needed and they still put in whatever was on the shelf which made the diff grind and clank a little like you’re describing.

[Janosh]

For example, this is the same weight as I use but not suitable for LSD’s:

Edited by Janosh on Friday 10th November 11:35

[LuS1fer]

Don't forget obvious sources of creaking, like the lower control arms. My aftermarket LCAs would creak until I used silicon grease and tightened to the correct torque. It would drive me crazy. The bushes also wear if they are standard.

[davedansky]

Hi Wayne (?), the creaking didn't happen at all until the diff was opened to swap the half shaft out, and when it does creak its only when warm and when turning, never when cold or in a straight line. There are some 'normal' suspension related noises that it always makes on uneven roads.