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Hey folks

2005 RT, 212k miles or so. Maggie has a severe driveline vibration/noise when decelerating. You can really feel it decelerating from 40 thru 35 (and incidentally 80 thru 75). As soon as you touch the gas pedal the noise/vibration goes away. Driveshaft couplers were replaced as a possible fix, but it didn't solve the issue. Motor/transmission mounts were replaced around 190k miles. Noise/vibrations occurs in neutral as well as different gears.

Any ideas? Was thinking driveshaft next but thought I'd ask the experts before spending more money aimlessly. Thanks for any help!!
 

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Before you change parts, look it over carefully. Have you checked the center carrier bearing for play? When you say vibration happens in neutral, is that rolling in neutral or while stopped in neutral?
The other thing to check while you are under the car is put it in neutral with the rear wheels off the ground and the back supported on jack stands and turn the drive shaft. Most manufacturers balance the driveshaft by welding a small weight to the shaft. If that weight has been thrown off (both shafts on either side of the carrier bearing should have a balance weight) you should see a clean spot on the driveshaft with a spot weld on either end of the clean spot. If either driveshaft has lost it's balance wieght, a machine shop that does driveshafts should be able put the bad shaft on balance machine and weld a new weight in place. I don't know where you live, but if the driveshafts have been exposed to salt and are badly rusted, you may need to replace them.
 
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