Found from GT40s.com -pages ;)
""Gearbox ratios 6 -speed, code ARX: 1,89 1,32 0,87 0,73 0,56 Final gear 3,50""
Check them, I think 1st gear ratio isn`t right typoed
http://www.gt40s.com/forum/gt40-tech-powertrain-transaxles/15381-audi-6-speed-transaxles-2.html