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 Post subject: transmission whine
PostPosted: Tue Oct 10, 2017 7:14 pm 
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my 2006 CRD with an automatic transmission has developed a whine as I deaccelerate. There is not a whine during normal driving at a speeds. Any ideas or comments would be helpful


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 Post subject: Re: transmission whine
PostPosted: Wed Oct 11, 2017 1:44 pm 
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Belizeman wrote:
my 2006 CRD with an automatic transmission has developed a whine as I deaccelerate. There is not a whine during normal driving at a speeds. Any ideas or comments would be helpful

Are you sure its from the transmission ?

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 Post subject: Re: transmission whine
PostPosted: Wed Oct 11, 2017 10:45 pm 
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Make sure the whine is not coming from your rear diff. Check your fluid.


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 Post subject: Re: transmission whine
PostPosted: Tue Oct 17, 2017 12:52 pm 
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does jeep has a special oil for the rear end..I have 80-90 wt gear oil..is that OK

any idea how to isolate the whine from the rear end or trans


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 Post subject: Re: transmission whine
PostPosted: Tue Oct 17, 2017 9:28 pm 
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Location: Oregon Coast Dairy Country. Land of stumps, dumps, and "Liquid Pumps"
If your 06 is stock, it does not require any friction modifier.

If you do any heavy off-roading or towing, I recommend a quality non-synthetic 75w 140 for higher film strength and better heat dissipation.

If you're doing only road / street / highway use, and not towing anything heavy, 75w 90 synthetic is better for the high speed shear protection.

Automatics don't tend to have a whine except when bound in 1st or second gear, as normally deceleration in these gears results in an immediate upshift. As such, the reverse faces of these gears don't get much in terms of break-in contact. Even then they are usually not nearly as loud as a differential, as there is a great deal more surface contact between a ring and pinion, and they have the same issues in terms of what faces are normally in contact. The forward contact faces, once broken in, become highly polished. The deceleration (or reverse) contact surfaces tend to retain more of the as-new machining marks, same as the transmission gears, only with more surface area.

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