PatrickNJ

'05 A4

I noticed a slight whine when the car slows (letting off the gas completely or using the brake) down only in the range of 50 to 40 mph. I have 15,000 miles on the car and was wondering if anyone has a similar problem and what you decided to do.
This may be related to reared whine but some of the members of this post say that it happens when they accelerate in the 40 - 50 mph range.
Should a flag be raised the next time I see the dealer?

Thanks,
Pat

 

GTO JUDGE

If the sound is coming from beneath to the rear of the car it very well could be the rear end whine. Although the symptoms are synonymous with acceleration what you describe is similar. I'd get it checked out.

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PatrickNJ

Thanks, the next time i get an oil change I will tell them about it.
It seems like everytime I take the car for an oil change I have an issue.
But what else is new.

Rukee

Your car's whining when it slows down cause it wants to go faster.




Sorry, couldn`t resist.

GTO JUDGE

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PatrickNJ

I wouldn't be surprised. Either that or maybe it just wants to retire.
Oh well I will keep you posted on my next visit to the dealership

cody6.0

My car had 4,000 miles and had the exact same symptoms.

Bearing pre-loads and backlash all effect pinion movement which is what makes gears whine during accel or deaccel. Most of the time being set up results in whine during accel and too loose will cause whine during deaccel.

Although keep in mind all gears make noise but some can be canceled out. GM had to deal with this issue in alot of it's trucks and SUV's.

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2007 CORVETTE C6 Z51
2007 SILVERADO W/T X-CAB 5.3
2007 SUZUKI GSX-R600

PatrickNJ

Cody,

So what did they end up doing to your ride?

cody6.0

Well I originally had them order a new replacement diff but when it arrived it was the same part number as my old one. So I said screw it and just lived with it until I traded it in.

I am starting to belive these diffs are just loud. Too many people have had noise then replaced it only to get some noise back later.

__________________
2007 CORVETTE C6 Z51
2007 SILVERADO W/T X-CAB 5.3
2007 SUZUKI GSX-R600

GTO JUDGE

The rear ends all have the same part number. The rear end is one complete unit compromised of many parts. No matter what part you buy for the car, the part number will always be the same. If the part number is different, then the part is different.

You are incorrect in your assumption it is the nature for these rear ends to be loud. Mine is as quiet as a church mouse. Every car or truck I have ever owned in my life was never loud. The car manufacturer does not build a car to be noisy. If there are noises coming from the rear it is not normal. Dana built a bunch of bad rears, some guys who have had their rears replaced got bad rears again. Some took 2 or 3 rears installed before they got a rear that was quiet.

I have ridden in many performance cars and have not experienced loudness coming from the engine, transmission or rear end. The easiest thing one can do is dismiss it as normal and forget about it.

My replaced rear got noisy a while after it was installed. That problem turned out to be a break down of gear oil viscosity. Had I dismissed it as a "normal" loud noise eventually heat would have gotten to the gearing and turned a simple fix into a major deal.

GM opted to replace rears, if the noise was normal, they would not have spent the money to fix a potential "non problem."

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