Some mod help
A. Kooks headers with ory and tune.
B. Above with 3000 stall converter
C. The converter and a new rear, either 12bolt or Ford 9inch with 373 gears.

I wouldn't consider a new rear for a bolt-on A4 car, unless something is already terribly wrong with yours. Keep wheel hop at bay (good shocks which you already have, and perhaps a control arm upgrade) and you might be shocked at how much the stock 10-bolt can handle behind an auto:
https://ls1tech.com/forums/gears-axl...ock-7-5-a.html
Keep in mind, once you have a ~3500 stall speed in place the difference between 3.23 and 3.73 will be no more than one tenth of ET reduction at best with a 4L60E.
The beast will come alive with convertor,suspension,and tires.








