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.
Car Problem Reports
Subaru Tribeca Vibtation or shutter on acceleration
Subaru Tribeca Problem
Average Mileage: 95,000 mi (70,000 mi - 120,000 mi)
Visitor, 2008 Subaru Tribeca, 70,000 mi
shudder/vibration throughout car at 40 mph and 60 mph speeds.seen numerous complaints about this issue.torque converter problem to blame