Automatic Transmission - m6 to a4 ?

[wanting yo know what are some of the components to do this i am going to convert my ta into a race car so just wanting to get some info and for those who have done this what were some obsticles that had to be overcome. cars is a bone stock ws6 m6 that is currently being gutted for the strip

i want to go with a th400 build will be procharged 402 cui lsx

Its will be easier to shift and you will make more consistent passes for sure.

yea i thought about it real hard about libert t56 faceplated but i need consistenty when i am racing car is losing alot of weight in some areas

http://www.ls1tech.com/forums/automatic-transmission/200477-m6-a4-a4-m6-conversion-info.html