hi all i was lookin at getting some diff gears for the wh gen 3 but i needed some advise on them i was lookin at 3.9's but i do a fair bit of highway driving what gears would be good for performance and still keeping decent highway economy??
3.7.3 mateOriginally Posted by bruzza
I got quoted for my rebuild for my vn ss v8 stock 3.08 with new crammnion and pinoin and 3.7.3 ratio $1100 SA Trans & Diff
* RVN 355 *
That would be Crown wheel & pinion.Originally Posted by subdue
BWAHAHAHHAHAHHAHAOriginally Posted by VN Calais 5.0
1.23:1 diff gears are hella tall!!!Originally Posted by subdue
2009 FG G6ET395rwkw11.76 @ 117 MPH (350rwkw)
yea i know 3.7s would be good, but they will make the car drink even more then 3.9's am i right? how much difference is there between 3.7's and 3.9's?
i got 3.9's in mine (i know not a gen 3) and highway driving is not so comfy. theres not much difference between 3.7's to 3.9's. i got 2 mates with vx ss's, one with a tune and zorst pulling 235 rwkw doing 13.7's with only a slight traction problem, yet the other vx with mafless tune & zorst with 206 rwkw but he has 3.45's and does 12.9 1/4's. so yeah diff is well worth it. but i would go for 3.45's as its perfect for cruising.
anyone know of a good diff shop in melbourne where i can take it down?
3:45's are a good in the middle range
Im a Three Speed
F(ast) : F(kn)F(ast) : F(kn)F(lat)O(ut)
Even if you got an Scanning Electron Microscope and pointed at my interest in this subject you still wouldnt be able to see it......
Preston Automatics And Differentials, they are very famous and i think they were on the "Grunt Files" dvd hope i helped
all those get judged by me, the king of kings..
I need some advice on how to change the diff oil in a vt Berlina....and what is the best oil to use
and then it all depends if you have an LSD or not.. If you have LSD you need to also buy a GMH LSD additive but as for the other oils, I think even your user manual wld have it in the spec sections.
Sorry for being frank, but I cant remember the oil weights atm, at uni and cant be to bothered looking around..
but just write 'diff oil change' in the search bar on the top of the forum.. will likely fix ur probz
Experience is a hard teacher. First you get the test, then you get the lesson.
we used the castrol diff/gear oil you can get from repco, bursons, autobahn, etc for a vt, like said above just got to work out if its lsd or not. castrol oil guide book at autobahn, etc will tell you exactly which to use or on the castrol website. Also price up the oil from holden, some times you find there the same price or sometimes holden is cheaper.
I have 3.7s, wish i had gone 3.9s (had them in a V6), the 4.11s are too tall IMO i had them as well. All autos
I have a VXclubsport 6 speed. Standard diff gears in my car are 3.73. Fuel economy is not and issue. Best I've seen it do before I did cam etc was 8.5ltrs/100km. This was filling up at BP and doing the Cruise for Charity last year on the drive to Bundoora. After the hole trip to Heatcote, staying in Bendigo and driving around then back home it averaged 10.2ltrs/100km. Now with cam etc it still gets 9.4ltrs/100km on a trip with highway driving. So if you won't to living that big bitch up go 3.73 or 3.9's because you fuel economy will change #### all. You will need to get your ECU speedo setting modifed to accept new gears as your speedo will be out, so remeber to keep this in mind as an extra expence.
I have a VX SS with 3.73s in it...it has been MAF less tuned made 340 HP at the wheels it sits on about 2500rpm at 110km with cruise control
I went 3.73 in my vy ss auto sits just under 2500 at 110 with cruise on
fuel economy around 13.5 to 14.5 i do mainly suburbs but to and from work on western highway for 25 ks each way
kicks off the line beautifully, i would recommend GM Motorsport for the diff change because they also have the Software to reprogram speedo and gearbox that the Retards at local dealer dont.
If you dont reprogram your speedo it will be anywhere between 17 and 23 ks out depending on speed.
haha i got 6spd with the 4.11 and i sit on about 2k at 110km/h, my speedo on the other hand things im doing 130 (used a gps to work out my speeds)
I find that under 100km/h im 10km out on the spedo and over 100km is 20km+
Would love to get the spedo fixed tho :P
when selecting diff gears you should take into consideration the type of transmission as well as intended application.
if you have a older 4speed auto (4l60e) which has a .70 overdrive you would be doing approx 2400rpm with a 4.11 diff @ 100km/h, however if you had a T56 trans which has .50 6th gear ratio @ 100km/h you would only be pulling approx 1700rpm.
also, 1st gear on a 4.11/T56 equipped car is only slightly shorter then the factory 4l60e/3.07 combo 1st gear
Body by Holden, Soul by Brockthe Legend will live forever
VN exec T5: 15.1sec @92.2mph 1/4 mile, 9.7sec @ 74.6mph 1/8mile, 2.3sec 60ft, 0-60mph 6.827sec 22/11/07 Gtech competition
Prob best to go for a ride in a few cars with different gears if ya can! The lower ratio u go the more responsive but alot of the time, the less kms per tank u wil get..depending on driving conditions but as a general rule of thumb..
IF YOU WANT MORE INCHES-STROKE IT!
even the 3.46 make a massive difference with the big weight of the WH over the standard 3.07's, i got 3.9's aswell but never put them in yet, IMO there would be hardly a difference between 3.9 and 3.7's, i doubt you would really be able to tell really
Going where no late model stato/caprice has gone before.... GAME ON!!
hey guys, i know this thread started years ago but seems people are still making the odd comment so thought i'd chuck up a question....i'm thinking about changing diff gears to 3.46 in my vy ss auto, will this put the speedo out? i will be getting them installed perfessionally. cheers