MR01Z28

Hey guys I am at a point where I am thinking of swapping my 3.23's out but am not sure if I should go with a 3.42 or a 3.73 in my A4 I have seen alot of people on here say they have an A4 car with 3.42's and alot with 3.73 also I am worried how many more mpg's I will lose with the 3.73 over the 3.42. I can assume i will notice a big difference with the 3.73 but i was wondering if anyone here can fill me in on what they gained with going from the 3.23's to 3.42's in a A4 car and if I should just bypass the 3.42's thanks

millersta

iTrader: (2)

go with the 3.73 its not worth it going from a 3.23 to a 3.42. and the mpg difference isnt that big i went from 22 mpg with 2.73's to about 19-20mpg with 3.73's and only lost 5-10 mph at the same rmp's. plus 3.73's are alot more fun than 3.42's.

FirstYrLS1Z

iTrader: (4)

4.56s' A4 here. 7 trips tp florida w 3.23s' gave me 24.5mpg,3 trips to florida w 4.56s' are giving me 21.5mpg.Based on that,4.10s' would have been giving me 23.5mpg and 3.73s' would have been 22.5mpg
Freeway legal speed cruise control rpm is 2900 with 4.56s'.
Go with the 3.73s'.

MR01Z28

thanks i will be looking for a set of 3.73's when you do the gear change do you have to mess with the computer tuning? and while i am messing with the rear i am looking for a good set of non adj. lower control arms any sugg. ? thanks for your input

bigj2717

iTrader: (15)

Yeah you need to get retuned for the gears. Really it just recalibrates your spedo and fixes your shift points

millersta

iTrader: (2)

if u dont have major mods u can get a handheld to tune for the gears. and for lca's i believe i have bmr non'adj tubular and they have worked great also look in to the relocation brackets they arent too expensive and help out.