I suspect that the roaring sound is related to special speed range, which may indicate that one of the gears in tranny is worn out. However, if you do not see big drop of fuel efficiency, then leave it for the moment.
First of all, observe fuel efficiency
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• 从爪牙给的统计看,变速箱问题比较多。这也是我最不愿意想看到的结果。 -宝驴车主- ♂ (115 bytes) () 12/23/2010 postreply 08:02:32