what diff gears for my vy

[kng55]

I got a leak in the diff of my manual vy ss. So I thought while they have it apart i mite as well put some lower gears in it, but i dont know if i should put 3.9 or go the 4.11 which ones do you's think i should put in it. And how much do you think they would cost.


And also i took it to willowbank the other day and it ran a 13.2 @ 108 m.p.h. Is that a good time. Its got 234rwkw

[TUNDV8]

They will cost around 1000-1300 depending if you have the speedo configured for the new gear ratio. 3.9 diff gears seem to be the go for a manual. You just have to ask yourself how much highway driving your car is going to be doing and how much of a daily driver it is. If it is more of a track car 4.11. Street and track i would go 3.9 for fuel economical reasons.

[GHZ28]

I got a leak in the diff of my manual vy ss. So I thought while they have it apart i mite as well put some lower gears in it, but i dont know if i should put 3.9 or go the 4.11 which ones do you's think i should put in it. And how much do you think they would cost.


And also i took it to willowbank the other day and it ran a 13.2 @ 108 m.p.h. Is that a good time. Its got 234rwkw

Going by the numbers I assume it has had a tune already, so you will need the tuner to reset the speedometer anyway.

3.91 is currently the highest ratio you can put in the late model diffs I believe, need the earlier model VT one for 4.11s.

3.91 is a very good compromise for the manuals, makes 6th usable. I have 4.11 in my Camaro though, and that is still eminently streetable with the MM6 box.

Garry

[VX_SS_II]

And also i took it to willowbank the other day and it ran a 13.2 @ 108 m.p.h. Is that a good time. Its got 234rwkw

That sounds pretty good to me.. I'm no expert but I'd be happy with that.

What mods do you have, or just a tune??

[RIDE:42]

3.91 fitted are around $950 fitted and you can fit 4.11 into a vr/vs housing to fit vx/y/z

[kng55]

thanks guys i will go for the 3.9, my wife takes the car to work so it would be more economical. im gonna get a maffless tune done so i can get a otr cai i'll get the speedo done then as well. It has ss induction cai, maff sensor, maff pipe and throttle body as well as extractors, dual 2.5" and a tune from Power Torque Engines.

[tuff304]

They will cost around 1000-1300 depending if you have the speedo configured for the new gear ratio. 3.9 diff gears seem to be the go for a manual. You just have to ask yourself how much highway driving your car is going to be doing and how much of a daily driver it is. If it is more of a track car 4.11. Street and track i would go 3.9 for fuel economical reasons.


What he said :werd:

[scwhls1]

aussie diffs in currumbin supply and fit new 3.9s for under $1000 0755983144

[markone2]

aussie diffs in currumbin supply and fit new 3.9s for under $1000 0755983144

Do they provide a warranty on there diffs for cars participating at Willowbank......Harts at Brendale do.

[scwhls1]

i know they have done plenty of cars that run at willowbank with many happy customers

[seldo]

Do they provide a warranty on there diffs for cars participating at Willowbank......Harts at Brendale do.
You might think that doesn't count for much but when I had my 3.9s fitted by Harts I wasn't happy with the noise level from the diff (some slight period noise evident in a quiet Calais spec Senator). Without any question at all, Harts fitted 4 different sets until I was happy, with not 1 cent extra in cost and even loaned me a deluxe (?)set of wheels while they did it... I've been around for a long time and I have to say that their service is absolutely exceptional. Full marks :bravo: