Question about 2005 Mazda 6

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Diff noise Hi, my mazda 6 sedan is making what I think sounds like diff 'whine' its an 05 with 86000 on it, isn't this a little early to be having any diff problems? Is there somewhere I can check the fluid or is it meant to be changed prior to 86000 ks, I dont know the service history as the car has not always been mine and it came with no manuals or service book.

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No this is not early.

Posted on Nov 24, 2008


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My car has a diff whining noise. I am going to sell the car and don't want to spend a lot of money on it, as I plan to buy a new car in six months of so.


You don't say what type of car you have and what mileage it has run so far.

Most likely the whine is from a very worn pinion gear.

Other than replacing or rebuilding the diff there is nothing you can do other than drain the old diff oil and replace it with new oil. ONLY use the manufacturer specified differential oil in the correct grade. This may quieten the noise a little but any difference will be minimal. It may help extend the life of the worn diff a little and it will get rid of any debris suspended in the old diff oil..

The diff drain plugs are often magnetic to pick up metal to prevent it being recirculated so check if there is much in the way of metal filings on the drain plug when it is removed.

Without disassembling the diff no one can tell you how long it may last but they are expensive to replace so I would be replacing the vehicle sooner rather than later if you don't want to replace the diff.

Until you sell the car, drive it gently when moving off from a stop and when accelerating to minimise stress on the diff.

If you are going to replace the diff oil yourself the car will need to be level and ensure you loosen and remove the diff oil filler plug before you remove the oil drain plug. If you drain the oil and the filler plug is stuck you will be in trouble. It will be a lot easier to just buy the correct diff oil and take the car to a reliable mechanic to drain and refill the diff for you while the car is up on a lift/hoist.

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1 Answer

My mechanic has found the transmission in my 2007 Toyota corolla ascent seca Hatch(automatic) to be noisy in first gear and also to be noisy when in top gear cruising at 60-70kms. There is a whining n


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I have a porsche cayenne turbo 2003.When I take my foot off the accelerator there's a whining noise coming from the front.When I accelerate,there's no noise.I took it to porsche and they told me my front...


sounds like your porche dealer is one of the "one for one" mechanics (repair it,no, replace it).assuming it is the diff,the pinion can be adjusted to reduce the noise on overun but you will need to get one of the old school mechanics to do this,as personally,ive only done one,in 35 years,i have even heard of some people that fit a thicker oil to reduce the whine........then sell the car.not nice.if you trust the guys that said its repairable,then they "sound"genuine enough.otherwise they would have tried to get you to change it (they make more money/take less time).

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There are many issues with the rear diffs on the Jeeps. The diff case bearings make a whining noise when accell or while in the cruise mode. The only way to properly repair this, is have the bearings in the diff replaced. This should be taken to a drivetrain/transmission shop. There are special tools to spread the diff case to remove the diff carrier assy. Most shops say,' I dont used one', which tells me they are not rebuilding it properly. The diff side bearings need to have .006 preload on them while they are being installed into the diff housing. It takes a special case spreader to do this. If they dont have it, move on to one that has it, and say yourself money in the long run. Cost of this repair, bearings- 175.00 and 6hrs labor. PS, dont install a used one, you will enjoy the same problem again or later.

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