Hey guys, I have a 99' A4 z28 and am about to buy 3.73 gears for it. Does anyone know if I have to buy 2-series or 3-series, or does it really matter? Thanks

 

You need to know what gears you have now. Check your RPO codes. You could have a 2-series 2:73 ratio most common or 3-series 3:23 which were a option. A quick check-if you DO NOT have a 1st gear select it a 2:73. Before ordering gears, make sure of which series carrier you have. Because it is a major mistake if you guess wrong.

 

a 3:73 takes a 3 series carrier so I really think your question is a little confusing