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It's probably the flywheel balance or a deteriorating pilot bearing. We have the same problem between 2700-3200rpm. It's a little worse in the lower gears than the higher ones. Watch the rpm and see if it's the same no matter what speed you are going, then you'll know if it's a driveshaft issue (flywheel, pilot bearing, clutch) or an axle/wheel issue.
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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