You might get away without the diffs, but it depends on the ratios.
You may also need a different engine ECU as some of it needs signals from the tranny ECU.
If you use the audiworld forums, the guy to as for is TozoM8.. He is the A8 gearbox god over there, converted his A8 to manual (auto only in the US too) and has rescued many a box for other members.
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