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Try depressing the clutch when it occurs to see if there's any change. If there is, it's the driveline - motor, trans or driveshaft. If there isn't, it's the diff, axles, bearings or wheels/tires.
I have a feeling there's an error stacking issue. Components are well within spec individually, but are out of spec as an assembly.
My 335 is buttery smooth. A great number of the components are common to both models.
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