I never truly resolved my issue. Rear mounts need to be looked at. Also, what have you done to your vehicle. My flex disc did not solve the issue. I sold my vehicle but I always wondered if the rear axle cups were pitted inside. This is a known issue with my other car upon acceleration. If it's all the time that is. If it's at higher speeds I would guess the wheels or bushings

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2001 X5 4.4i WHITE-Loaded like a baby's diaper SOLD