Another Rear-End whine Thread - Pontiac GTO Forum
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post #1 of 12 (permalink) Old 10-07-2006, 09:43 AM Thread Starter
 
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Another Rear-End whine Thread

I have been noticing the famous rear end whine at 45-50 mph (05/A4 6k miles ) under acceleration. My question is this how many of you have actually had the rear replaced and did it acutally solve the problem. I am not sure how my dealer would react to changing this if they say its normal than I am going to have to fight for this and is it worth the fight to get it replaced and the freakin noise is still there once the new unit is in. Perhaps we can start a pole of how many rears have been replaced and what dealership they used. If anyone has dealt with Sheehan Pontiac in Lighthouse Point, Florida or any other in South Florida please chime in. thanks.....
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post #2 of 12 (permalink) Old 10-07-2006, 09:51 AM
 
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Weve replaced a few complete units to solve this. Mine moans slightly at 40mph, but not enough to bother me.
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post #3 of 12 (permalink) Old 10-15-2006, 06:50 PM
 
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Oh how I long for the days of my original diff which would only whine at 40-50. Dealer has replace two. The one I have now is much noisier than the original. The first replacement sound like it had gravel in it. GM is coming (When I dont know) to have a listen. I am not a happy camper with my dif.
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post #4 of 12 (permalink) Old 10-15-2006, 07:05 PM
 
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What percentage of cars do this and is it inevitable after a certain amount of miles?...for instance I had an Alero a few years back and it was a problem that the lower intake gaskets would go bad, some would go bad at 30,000 miles, other after 100,000 miles...any feedback?
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post #5 of 12 (permalink) Old 10-16-2006, 08:34 AM
 
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I get the same faint whine at 45-50mph. I’m at about 6000 miles so far and it hasn’t gotten worse… I’m going to wait until 30,000 before I decide if it’s something I should be worried about. It just might be a normal characteristic of the real wheel differential… I had an old dodge van that used to whine at certain speeds… did it for the 100,000 miles I drove it and it never got worse… Sold it to a friend and it’s still on the road…

But if you are worried about it then avoid driving in that speed range. Obviously it’s a result of the harmonic resonance/vibration at that shaft speed… Everything has a natural harmonic resonance and the bigger and heavier it is the resonance is more pronounced. It seems that this is far too common a sound for the designers of this differential not to have noticed and addressed… If it gets worse then get it fixed…

I guess the real question should be if the GTO has a track record of the rear differential ACTUALLY going out…

The GTO has only been in production for 3 years but is there a database available that might show a pattern of rear differentials going bad…Has anyone on this board experienced their differential going bad?
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post #6 of 12 (permalink) Old 10-16-2006, 10:58 AM
 
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If you have changed out the gear oil, but did not put in the GM friction modifier, I would suggest starting there. I just added it to mine and all the noise went away.
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post #7 of 12 (permalink) Old 10-16-2006, 12:51 PM
 
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I’ll give it a try…

I doubt many here have changed their gear oil out since the cars are soo new…

Do you know if this would be covered under warranty? I mean if the whole purpose is to reduce a whine noise that was there when you bought the car it should be covered…
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post #8 of 12 (permalink) Old 10-16-2006, 03:18 PM
 
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If you have not changed your gear oil, then friction modifier will not be the problem and yes "it" (the whining noise) should be covered under warranty. If you did change the gear oil and you didn't put in the friction modifier, you can pick up a tube for 5 dollars at Autozone.
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post #9 of 12 (permalink) Old 10-29-2006, 04:11 PM
 
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2005 A4 here.
Noticed mine at apx 600 miles. Had it replaced at around 6,000 miles, now over 9,000 and quiet as a mouse. (rear end anyway)

Jeff
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post #10 of 12 (permalink) Old 10-29-2006, 07:31 PM
 
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is it automatics or manuals not quite sure?
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