new here so be patient, working on 93 z when purchased it already had cat back and punched out cat, 160 stat, and cai. next thing working on is gear pretty sure it has 2.73 stock and it needs to go. have friend that has two gears that are free one is a 3.42 and the other is a 4.10 not sure what to go with and input would be great

 

by the way a4 trans

 

If it is an A4 trans than I would recommend going with the 3.42. A 4.10 is way too much gear for an A4.