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Noise coming from diff, AU xr8 

 

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 Post subject: Noise coming from diff, AU xr8
Posted: Fri Sep 22, 2006 12:56 pm 
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just a quick question guys

i own a series 1 au xr8 and there is a noise which sounds lke its coming from the diff, its sounds like a hammer hitting sumthing. Its generally at its worst when im cruising between 60 and above and i can clearly here it from inside the car, and also a slight wobble can be felt too. i think it has sumthing to maybe do with the type of oil and or pretension set on the pinion bearing, but im no expert so if anyone has encountered this problem before that help me out that would be appreciated.

cheers
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Posted: Fri Sep 22, 2006 1:02 pm 
Getting Side Ways
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Could be backlash from the diff or if it happens over bumps maybe a worn knocking shock. Another thing could be a worn UJ (universal joint)
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Posted: Fri Sep 22, 2006 1:08 pm 
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Being XR8 it would be IRS, it could be the drive shafts mate, CV joints might be knocking.
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Posted: Fri Sep 22, 2006 1:29 pm 
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I forgot to add if it was a worn UJ there would be a driveline vibration over about 80km/h it would be quite bad especially if the UJ was worn enough to knock at 60 km/h. Best to check anyways but i would doubt if its the UJ.
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Posted: Fri Sep 22, 2006 3:52 pm 
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Do you guys know what the pinion but tension is? and if there is a collapsable spacer in the AU diff?
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Posted: Fri Sep 22, 2006 6:04 pm 
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Could be a broken shock mount...there are more than a few guys with IRS AU's out there that have had this problem.

Open the boot, and remove the boot carpet so you can see the top of the shock mounts (from inside the boot). Then have someone bounce the car up and down on either side.

Should be pretty obvious if they are stuffed.
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Posted: Fri Sep 22, 2006 6:39 pm 
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You mean a Crush sleeve, to set the Pinion pre load yeah?

One thing you could do is grab the tail shaft and see how far you can turn it before it locks up, there should be bugger all movement in it.

If it has a lot of slop in it and after ruling out you uni Joints next step would be to pop the diff face off and check the backlash with a dial indicator, if that is within spec then the culprit is probably the CV’s, and I bet they would be fun to change on a IRS set up.
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Posted: Fri Sep 22, 2006 9:28 pm 
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I've gotta change my shafts soon, i've got a driveline vib and i get the feeling it's the CV's causing it, plus i heard it knocking when i pulled out of a servo a cpl of weeks ago so i'm changing them either way.
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Posted: Mon Sep 25, 2006 11:08 am 
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thanks guys for your input but ive managed to solve the problem with a quick and easy solution....selling the car, hehe so i its not my problem anymore phew!! all this talk about changin CV's and pullin the diff apart was startin to get me nervous, but luckily i got a phone call the friday with sumone interested in buying the car and by saturday she was gone haha so everything worked out fine in the end..
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Posted: Wed Sep 27, 2006 1:34 pm 
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Hope you told the buyer about the diff/driveline problem. :evil:

 

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