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there are a few potential reasons for the SVX failure rate (IMO).
1. Gearing - the Impreza and Legacy had ratio typically of 4.1 vice 3.5 in the SVX - smaller numbers means more strain
2. Weight - greater weight means more strain
1 & 2 above create heat - the greatest threat to an auto tranny
3. A screen/filter found inside the radiator that was too fine and clogged with wearing clutch material - which in turn reduced flow inside the tranny - that then induced another failure mode (worsened by #1 and 2 above).
And so, several of us on the forum have gone over to 4.11 or 4.44 auto trannys - which (IMO) improves the daily driving experience and little or no effect on gas mileage.
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