i was looking for a ford 9inch with 3.73 and found a whole rear with 3.90s do you guys think this will be to radical for a a4 that is street driven most days?

 

Lots of people will give you their opinions, personally I see no issues with 3.90's in a dd a4 / 4.10s in a dd m6. I wouldn't go any taller thou.

But at the end of the day it is what you are comfortable with,

Check this out and work out your preferences:
http://www.f-body.org/gears/

 

alright thanks man.. thought between 3.55 and 3.90 is good for autos as dd.. anything more then that is a no no

 

3:90 is a nice all around gear for the A4 & M6 trannys, max on the A4's and min. on the M6's for the street.

 

ok thank you.. hopefully i can work a deal out with this guy to get the rear