Diff Gears - Need Feedback Asap!!!

[BEARWOOD]

Need help deciding on 4-11s or 3-9s for my vz ss ute.Have heard many people happy with their 3-9s but am wondering if they are noticeable enough or would it be money better spent on the 4-11s. I relise their will be pros n cons with either set up but my biggest concern is traction under full throttle and the practicality of 1st gear if i opt for the 4-11s.The ute is driven daily and at the moment is pumping out 227rwkw with exhaust and tune.
It would be appreciated if anyone who has had this mod done could give me the fors and against of whichever way they went.Was thinking of going back to Sams Perf to have job carried out,any comments on this would also help alot.

ps.Will be the final mod to the car.

Thanks in advance ;)

[alexcs]

i think 4.11's are really only worht it if youre after the best ET at the drags. i tihnk youll find 3.9's annoying enough cruising at 110kmh @ around 2100 with the exhaust. this is one of the tihngs holding me back, anything above 100 cruising may be a little annoying in a m6 with a loudish exhaust.

[NickS]

Need help deciding on 4-11s or 3-9s for my vz ss ute.
3-9s should be plenty unless you are after every last split second at the strip


Was thinking of going back to Sams Perf to have job carried out
Sam can do this and is highly recommended :thumbsup:

[scat2k3]

......ps.Will be the final mod to the car.

Thanks in advance ;)

:lol: :lol: :lol: Riiiggghhhtt

Check this thread. It should have all the opinions and info you need

Diff Gear Review Thread (http://www.ls1.com.au/forum/showthread.php?t=23130)

Cheers,

Scott

[NickS]

:lol: :lol: :lol: Riiiggghhhtt
:lol: Heard that one before too have you Scott

[Febs]

If I'm not mistaken going to 4.11's means a bit more work too (something about there not being a standard 4.11 drop-in replacement gearset? I could be totally wrong).

I'd go 3.9's (unless as said - you're chasing every split second down the 1/4). You'll definitely notice the difference over the 3.46s.

Cheers,
- Febs.

[BEARWOOD]

Thanks for the feedback guys.Checked the links that were offered but found very little info or feedback about the 4.11s,think maybe they are not yet as popular. Yes there is abit more work and expense in 4.11s but thought maybe it'd be worth it.
I am not yet convinced on the 3.9s as i like to notice where my money has gone and have no regrets on spending it,so if you have done the 4.11s or know of mates who have please give comments and as much detailed info as possible.


Sorry if this topic has been flogged in the past but need to make an informed decision by tomorrow. :bash:

[Scud]

Go the 4.11's, after driving a H&C M6 with 4.11's (albeit with a locker), I was amazed at the driveability. If you are condsidering 3.9's then I'd say forget it and go the 4.11's. They are sweet to cruise with, 6th gear becomes usable at "normal" speeds, and fuel economy doesn't appear to be affected hugely.

[Upon_1]

wats the cost of 3.9's? and how much more are 4.11's?
Cheers guys

[markone2]

Go the 4.11's, after driving a H&C M6 with 4.11's (albeit with a locker), I was amazed at the driveability. If you are condsidering 3.9's then I'd say forget it and go the 4.11's. They are sweet to cruise with,.

Did you drive all the way in a straight line ..with ear muffs on :eek: ....my experience with Locker Diffs is *worst diff choice ever* for street use...and why any-one would put up with them when 4.11 LSD's are available is totally beyond my wildest comprehension…..sure the Locker works fine on the track ..as it is designed to do. but imho the LSD does it better ….and is also legal to drive on Australian roads….the locker is not.. .. Personally I will never have one again ..Period. ...not only that but the locker plays havoc on the rest of your drive line...and ALL 4 tyres...try a 4.11 LSD job and your car will love you for it ;)

[Chris52]

4.10's in the crewie (dana diff) ,driveability is magic with the M6.

Cheers

Chris.

[BAD355]

Need help deciding on 4-11s or 3-9s for my vz ss ute.Have heard many people happy with their 3-9s but am wondering if they are noticeable enough or would it be money better spent on the 4-11s. I relise their will be pros n cons with either set up but my biggest concern is traction under full throttle and the practicality of 1st gear if i opt for the 4-11s.The ute is driven daily and at the moment is pumping out 227rwkw with exhaust and tune.
It would be appreciated if anyone who has had this mod done could give me the fors and against of whichever way they went.Was thinking of going back to Sams Perf to have job carried out,any comments on this would also help alot.

ps.Will be the final mod to the car.

Thanks in advance ;)
I think everybody is under the impression that you are running the M6, is that correct?

If so, approx revs at 100kph should be
3.9 - 1700rpm
4.11 - 1800rpm

In reality, there is not a whole lot of difference between the 2 ratios. I am sure that you would be happy with either, though there may be a small compromise between acceleration and fuel economy with either choice...

[chesso]

Thanks for the feedback guys.Checked the links that were offered but found very little info or feedback about the 4.11s,think maybe they are not yet as popular. Yes there is abit more work and expense in 4.11s but thought maybe it'd be worth it.
I am not yet convinced on the 3.9s as i like to notice where my money has gone and have no regrets on spending it,so if you have done the 4.11s or know of mates who have please give comments and as much detailed info as possible.


Sorry if this topic has been flogged in the past but need to make an informed decision by tomorrow. :bash:

I've just started looking at the same mod, I believe 4.11's are not available in the larger crown wheel size as fitted to VT series II onward. I understand that they are available in the smaller crown wheel size as fitted to VT series I and you would need to swap the whole centre (and halfshafts?) and end up with smaller gears at the end of the day. Thats my understanding and I am sure I will get corrected if its inaccurate.

All this was described in a thread recently in more detail but I'm too lazy to go find it today.

I'm going for 3.9's just because of the immense positive feedback from M6 owners.

[mechatron]

Go the 4.11s. It launches the car alot harder in first gear, and the 4.11s make 3rd and fourth so much more fun. And best of all you can actually accelerate in 6th gear. Anyway here are the costs:

3.9s - $1200 (including recalibration of speedo and using existing diff housing and obviously new gears)

4.11s - $1650 (including recalibration and complete new diff centre including new lsd and diff gears).

And whats really amazing is that in 6th at 120kph you're doing approx 2000rpm - perfect.

[Scud]

Did you drive all the way in a straight line ..with ear muffs on :eek: .

My advice was for the 4.11's, the fact that my experience was with a locker is unimportant to the original poster. I am passing on feedback relating to the ratio and the effect on drivability.

However since you asked, your experience with a locker and mine vary immensely. I had no issues with the locker after takeoff. Once the car was moving there was no discernable noise difference. During low speed cornering (under 10km/h) the locker made is presence known but apart from that it was very well behaved.

[8throttlebodies]

I recently went from 3.46 to 3.91 in a M6. AWESOME...
I feel the car is just right now..
I was in a M6 H/C car the other day with 4.11 locker, and I wouldnt want one for my daily driver.

8tb

[lucas]

First off mechatron is correct - 120km/h == 2000rpm on the dot.

If you are fair dinkum about no more mods, then I would suggest taking a good hard look at the 4.11's. When I had just the edit+exhaust+4.11's it felt really good. If you are after ET, it works pretty well as the redline in 4th is around 190km/h (118mph).

Buuuuut if you are thinking of going cam/stroke/forced induction, then IMHO 3.91's are "enough". I reckon once you start going > 600nm the extra effect of the 4.11's becomes a liability - wants to spin up far to much.

Personally, I am waiting for the L in my LSD 4.11's to finally go (had them shimmed already, but don't expect it to last) then I'll take a good long look at some 3.91's from KAAZ ;)

[BEARWOOD]

Well i finally decided to go with the 3.9s. The fact that i wont be racing the car and that i do use 1st gear alot and want to keep some traction under full throttle has brang me to this decision. Will hopefully be getting it done Friday morning by Sam.

Thanks heaps for all your help in making my decision. ;)