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1. The aggressiveness of the 3.91 gears in the A6 has nothing to do with the "differential" being different, it is because the 1st and 2nd gears in the automatic transmission are more aggressive than on the SS M6 transmission. If I remember correctly, the gears in the 1LE M6 transmission are even less aggressive than the regular SS M6 transmission.
2. The differential in a 1LE is the same as the differential in a A6 or M6 SS, just with 3.91 gears. As previously stated, it's the "aggressive gearing" in the transmission, coupled with the "lower" 3.91 gears, that makes some people say that the overall combination is too aggressive. I can't speak from personal A6 experience, but in reality, unless you're worried about getting the lowest possible ET's at the track, the 3.91's would probably be perfectly fine in an A6 street car. It's when you start getting into the high HP numbers and/or serious drag racing that the aggressiveness of the 3.91's becomes a problem.
3. Overly-sticky tires are only going to compound the aggressiveness, and you could start breaking driveline parts, such as axles, spider gears, etc.
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