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Old 03-29-2013, 10:14 PM   #1
Scooby Newbie
Member#: 232418
Join Date: Dec 2009
Chapter/Region: MWSOC
Location: St Paul
2002 WRX Wagon

Default Whine on acceleration and shifting - AT

I am helping a friend with a new car figure out a few problems and this is the most worrying. The car is a 2000 Legacy Outback limited with Automatic Transmission. 108k miles.

When accelerating the car has a whine. It becomes louder as speed increases. Can't hear it much below 25mph, but it's very pronounced by 60. It goes away instantly when you let off the accelerator. It briefly does it again as the transmission shifts while decelerating. I can feel vibration in the shifter while it is whining.

Previous owner stated the car needed a front passenger axle. The CV boots are fine, but both front axles have a bit of slop where they enter the tranny. Transmission and front differential both have adequate fluid levels. The noise does NOT go away when turning (so not wheel bearings).

Could this be a simple axle issue or are there worn/damaged gears in the transmission or front diff? How about the output for the drive shaft?
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