auto trans replacement

[golonaus]

hi
im about to purchase small project
2000 S with bad transmission
I will probably use audi/vw box
what's my best bet?
will trans from lets say 2002 audi s4 have more aggressive gearing than from a4?
do I need to change computer too , or the one in the boxster will work?

thx in advance


ps.
yes, i did search
just want to be sure before Ill pay the guy