Sadly they have all the same weak spots as all the others.
Does it grumble while moving, or while stationary as well? If moving it could be diff oil level. They are notorious for leaking out of the output flange seals, FWD versions even more so than quattro. The diff could be grumpy if it's low on oil.
If it grumbles while in drive but stationary then that could be the torque converter. Hard to tell without hearing it, and even then not easy to diagnose without taking it apart.
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