Winding down noise on deceleration or coasting

I've recently noticed a noise in my 2009 SR5 automatic when I'm coasting. I can only describe it as if the engine is winding down or in a hill assist mode (don't have option on truck). My RPM's are fine and I don't feel a lag at any time. I have 58,000 miles and have not serviced the tranny or diffs. Any thoughts?

 

Air intake whirl is what I notice when decelerating. Nothing wrong with it.

 

any audio upgrades? almost sounds like you have alternator interference

 

Might be feeling this ? did you recently have the battery disconnected ?
ENGINE BREAKING and harsh downshifting .
For you guys with higher mileage ....Read this http://www.sonnax.com/parts/1778
Page 33 and 34 of this PDF explains downshifting
http://www.toyotatundraforum.com/pdf/A750E.pdf
Are you effected by the TSB ? http://www.pdf-archive.com/2012/01/0...sb-0373-09.pdf
beleive it or not , your truck is designed to save fuel when coasting . When you take your foot off the gas , the PCM tells the injectors to turn off . This is why your truck feels like its slowing down in comparison to older vehicles you have owned . Combine this with the converter remaining locked up and the transmission downshifting while going down hills can really be felt in the drivers seat .

 

There are more issues described in this post regarding the transmission if you beleive the trans may be the issue .
Read here :
http://www.tacomaworld.com/forum/te...hift-kit-shift-recalibration-kit-2nd-gen.html
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