Welcome to Just Commodores, a site specifically designed for all people who share the same passion as yourself.

New Posts Contact us

Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

3.9 or 4.11 diff??

SlvrR8

New Member
Joined
Sep 14, 2011
Messages
93
Reaction score
1
Points
0
Age
34
Location
Townsville QLD
Members Ride
Vx Clubsport R8
Hey guys I'm looking at changing the gears In my vx clubby from the standard 3.7 gears to either 3.9 or 4.11. Any advice from people who have had it done would be great. I was leaning to 4.11 cos going 3.9 wouldn't be much difference I'd imagine. Cheers
 

Buckd1ch

Member
Joined
May 31, 2009
Messages
70
Reaction score
1
Points
8
Location
Gold Coast QLD
Members Ride
2012 SV6 A6
You are right in saying it wont make much difference going to 3.9's. But 4.11's is just wheelspin heaven. I would reccomend test driving a car with 4.11 diff before getting it done. They arent for everyone.
 

SlvrR8

New Member
Joined
Sep 14, 2011
Messages
93
Reaction score
1
Points
0
Age
34
Location
Townsville QLD
Members Ride
Vx Clubsport R8
Cheers for advice, I can't justify spending over 1k on 3.9s and not feeling a diff
 

Buckd1ch

Member
Joined
May 31, 2009
Messages
70
Reaction score
1
Points
8
Location
Gold Coast QLD
Members Ride
2012 SV6 A6
What other mods are done to your car? In all honesty the money could be used more wisely.. 3.7 is a nice ratio with good low down torque without sacrificing hwy fuel economy.
 

LETZRIDE

New Member
Joined
Sep 7, 2011
Messages
33
Reaction score
0
Points
0
Age
36
Location
Canada
Members Ride
Camaro
I dunno if your tranny gears are like ours, or which tranny you guys have...but if it is like ours I'll say go 3.90s...I originally had 3.90s in my car and loved them...after blowing 2 rears and putting in a ford 8.8 I didnt have a 3.90 option so I jumped up to 4.11's...I did notice a difference over the 3.90's as it took out some flatspots, but to be honest the gears are too short. I have an A4 and as you know you cant go WOT into 4th gear because of the converter locking up, 3rd gear will wind out to about 202km/h at 6500-6600 rpm which I don't like churning the car to.

Secondly my gas mileage took a BIG hit...I used to get 550-570km to a tank of gas all highway, with the same kinda driving Im struggling to push 500km to the same tank.

I'd love to have my 3.90s back...great performance and easier on the wallet.
 

GRPABT1

Jakstas' Warden
Joined
Sep 12, 2010
Messages
501
Reaction score
3
Points
0
Age
39
Location
The ville
Members Ride
VN shitta
What gearbox you running? T56 is perfect for 4.11's with a long first gear and two big overdrives.
 

SlvrR8

New Member
Joined
Sep 14, 2011
Messages
93
Reaction score
1
Points
0
Age
34
Location
Townsville QLD
Members Ride
Vx Clubsport R8
My bad should of mentioned it's an M6. Mods are just mafless tuned 253rwkw. Cheers for input guys
 

SlvrR8

New Member
Joined
Sep 14, 2011
Messages
93
Reaction score
1
Points
0
Age
34
Location
Townsville QLD
Members Ride
Vx Clubsport R8
And I'm planning on camming it at around same time so what do use reckon. Will 4.11 be just to short with that set up? Keep in mind I only drive it on weekends etc
 

Buckd1ch

Member
Joined
May 31, 2009
Messages
70
Reaction score
1
Points
8
Location
Gold Coast QLD
Members Ride
2012 SV6 A6
Ahh might be ok for a weekend warrior. Aslong.as your.not fussed with fuel consumption. Cam+4.11's will not be pretty in terms of fuel.
 
Top