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Help on diff gears

Discussion in 'LSx Development and Modification' started by bruzza, Apr 10, 2006.

  1. bruzza

    bruzza New Member

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    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??
    thanx all
     
  2. RVN 355

    RVN 355 New Member

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    3.7.3 mate

    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
     
  3. 383 hatch

    383 hatch Well-Known Member

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    That would be Crown wheel & pinion.
     
  4. OLS108

    OLS108 MR Helpful

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    :hit: BWAHAHAHHAHAHHAHA
     
  5. AirStrike

    AirStrike Administrator Staff Member

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    1.23:1 diff gears are hella tall!!!
    AirStrike :air:
     
  6. bruzza

    bruzza New Member

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    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?
     
  7. IBLOWN

    IBLOWN Well-Known Member

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    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.
     
  8. bruzza

    bruzza New Member

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    anyone know of a good diff shop in melbourne where i can take it down?
     
  9. SLugg

    SLugg Member

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    3:45's are a good in the middle range
     
  10. Jecs

    Jecs PAVTEK Race Engines Staff Member

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    Preston Automatics And Differentials, they are very famous and i think they were on the "Grunt Files" dvd hope i helped

    Jecs
     
  11. sloth1198

    sloth1198 New Member

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    I need some advice on how to change the diff oil in a vt Berlina....and what is the best oil to use
     
  12. DrZ

    DrZ New Member

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    Try having a search through all the threads here.. there are even a few 'how too's' which tell you how to do the whole job urself with the appropriate oils...

    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
     
  13. eaton v8

    eaton v8 my little sleeper

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    .................
     
  14. cpbait

    cpbait New Member

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    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.
     
  15. helicraze

    helicraze New Member

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    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
     
  16. DrZ

    DrZ New Member

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    Huh? 4.11s are to tall?? What are you running? 26" rims?? If 4.11s are to tall for you 3.7 must be rediculasly tall for you mate..
     
  17. mooseboost

    mooseboost New Member

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    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.
     
  18. VX SS 340 HP

    VX SS 340 HP New Member

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    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
     
  19. Chrisvyss

    Chrisvyss New Member

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    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.
     
  20. vuTobySS

    vuTobySS New Member

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    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
     

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