How loud is rear end whine? - Pontiac GTO Forum
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post #1 of 18 (permalink) Old 01-31-2006, 05:00 PM Thread Starter
 
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How loud is rear end whine?

Is it always really loud or can it be quiet? I think I've heard a soft whistling noise at 45-55ish mph but I sometimes hear tire noise as well which I might mistake for the differential. I took my GTO on a drive with a service manager at the dealership and most of the time he said it was likely tire noise but towards the end of the drive he said he noticed something that might be the characteristic rear end whine. My car is an 05 A4 with ~1200 miles.
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post #2 of 18 (permalink) Old 01-31-2006, 06:08 PM
 
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Mine has it a little, 05 m6, between 45-50. No big deal though.
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post #3 of 18 (permalink) Old 01-31-2006, 06:23 PM
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Garage
Some guys described a loud whine, some have reported a barely noticeable whine. My whine isn't that bad but it is noticeable. It was noticeable enough for the service manager to verify a new rear was in order. He also told me that another guy was in with one and complained of whine but it was not enough to warrant a replacement.

I don't know if this is true or not, but I was told that GM is tightening their belt on wholesale replacement of rear ends. They are requiring further examinations or other alternatives before replacing.

All I know is my replacement is on a ship headed for the states, and is due in mid Feb.

IMO...if it is true what I am told, I'd suggest getting it taken care of before GM decides not to replace them anymore.

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post #4 of 18 (permalink) Old 01-31-2006, 06:28 PM
 
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When it gets to the point where its noticeable, you'll know. I am on my second one and its starting to whine after 300 miles. Back to the Dealer I go.....
It's usually between 48-55mph and only under acceleration.
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post #5 of 18 (permalink) Old 01-31-2006, 07:16 PM
 
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what exactly causes the whine, is there damage inside the rear end or is it really just a normal thing?
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post #6 of 18 (permalink) Old 02-01-2006, 10:20 PM
 
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Quote:
Originally Posted by HotRodGuy
what exactly causes the whine, is there damage inside the rear end or is it really just a normal thing?
Here is my best guess..... the root cause is improper gear tooth contact due to an assembly process control problem setting the proper pinion to ring gear engagement and backlash. These settings are critical to obtain quiet gear mesh

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post #7 of 18 (permalink) Old 02-02-2006, 06:51 AM
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Quote:
Originally Posted by cat1055man
Here is my best guess..... the root cause is improper gear tooth contact due to an assembly process control problem setting the proper pinion to ring gear engagement and backlash. These settings are critical to obtain quiet gear mesh
do it cut the performance or is it just noise?
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post #8 of 18 (permalink) Old 02-02-2006, 09:40 PM
 
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Originally Posted by EEZ GOAT
do it cut the performance or is it just noise?
It's just noise but if it continues to get louder the differential could eventually fail. My second diff. makes a faint whine and I will monitor noise level and go back to the dealer if the noise increases

2005 GTO, M6, Quicksilver / Black
2003 GTP, Silver / Black, 3.4" Pulley
1994 Z-28, Red, M6, Hotcam, SLPs, Tune
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post #9 of 18 (permalink) Old 02-03-2006, 01:30 PM
 
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I just noticed mine last night.. cruising at 50 mph in 6th I could hear it clear as day without the music on.. but only at like 15% throttle (just a guess not an exact measurement people) basically enough to keep the car at a constant speed.. but when I stepped on it a little bit it went away completely or when I let off the gas same thing.. I don't know.. I can deal with that if it doesn't get worse.. besides its a rareity that I'm ever off the gas or not accelerating or that I'm not playing music.. lol..
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post #10 of 18 (permalink) Old 02-03-2006, 03:20 PM
 
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It doesn't directly affect performance but it results in uneven wear on the gear set and premature failure.

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