Don't know right off. But if it's an A6 then it has what you need, pretty sure the US 'officially' only got the one version of the 01E 6 speed trans (well two if you count the Allroad?, and now that I think of it the B6 A4 is technically an 01E?..but is different enough that it doesn't swap easily), which is the same one in the B5 S4. There may be a few oddballs rolling around, but they would either have been imported or custom from what I know. What you want to avoid is an Allroad parts car, gearing isn't right. You shouldn't have to touch the rear differential, it should match the A6 trans just fine.
Go get it and get to work.
There was a 6-speed swap thread in the chatterbox with ratios all listed, but seems like alot of stuff has been purged..wasn't able to find it.
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