Vibtation or shutter on acceleration on Subaru Legacy

A vibration or shutter may be noted on acceleration. If the transmission torque converter is suspected a revised part is available to correct this concern.

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Average mileage: 116,766 (98,532–135,000)
Drive Train affected: 2.5L 4 Cylinder Turbo
2 model years affected: 1997, 2009
4 people reported this problem
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problem details
2009 Subaru Legacy 98,532 mi,
Loud rattling. Mechanic said I needed to replace my catalytic converter, but called Subaru and it's part of the recall, so it's free.
1997 Subaru Legacy 135,000 mi,
considering purchasing this vehicle. not sure how long the previous owner operated the vehicle with this problem. the only thing I noticed is the shutter on shifting 1st to 2nd gear. I have an automatic.