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  1. #1
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    Default Best Diff shop that makes custom axles Melb Syd

    HI all ,
    Looking for the best diff shop that makes there own axles. Supply a complete 9inch also to suit holden .

    Story is that due to rear disc brake set up the axle needs machining in a less common way that's not common stocked by ozzy workshops . Axle needs to be made from scratch or machined from blank billet then hardened .

    Places I have found already that will do it are

    John Taverna chassis a good reputation I assume been in the biz along time

    Diff King specialist and cheaper than above

    Please give opinions on above and any other places people would recommend .

  2. #2
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    Altra 9 in Brisbane, awesome work

  3. #3
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    Hi
    Yes Altra 9 Good no dought , I found there return ph calls lacking and he return quotes Whenever they get to it and not as requested specification !! He is also the most expensive .
    John Taverna less expensive and responsive to requests . I would go with JT b4 above Altra 9

    The above 2 are 1000-1500$ more than anybody else .



    Come on everyone . What are your experiences ???

  4. #4
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    Ok fair enough, maybe he doesn't like you lol . I found the exact opposite Sorry I bothered commenting now

  5. #5
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    hi
    Greg greatfull for your response . His wife relays all the info !!. Should have sent an email I guess .

    I`m just exchanging opinions . Trying to discover peoples experience that's all .

    Found Geelong diffs good response but do not make axles ,so unfortunately there out .
    Keysborough diffs the same as above donot make axles ,out as well .

    Diff King have not made my mind up about them yet .

    J Taverna u get the feeling just gives a flat rate price but I'm sure he is experienced and knows his pricing/jobs well .

  6. #6
    Do you ever leave? EH179's Avatar
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    Aussie Diffs @ Currumbin Gold Coast, may be able to help.

  7. #7
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    hi
    EH179
    Aussie diffs does not make axles from blanks or otherwise. Off the shelf stuff only .
    They only do rear early commo brakes for early holdens . That's fine for smaller vehicles but fairly ineffective on larger cars .

    Vn commo rear pads are...... half the size ...... of HZ /WB rear [early falcon the same ]

    The brake balance of vn rears and HQ fronts would create a sizeable inbalance of the brake system I suspect .


    PROBABLY need to INCREASE rear brake pressure A HUGE amount to run rear commo vn installed on a HQ --WB
    This would lead to high heat and increased pad / disc wear


    From Bendix
    vn commo rear pad 29.9 sq cm
    Ea falcon rear pad area 45.6 sq cm
    XF falcon 58.4sq cm
    Hz --Wb , Early Falcon Xa --Xc 57.8 sq cm

    Vt commo rear pad 32sqcm

    So Vt commo
    is the go but apparently caliper and disc are fine but u need an aftermarket adapter plate and banksia brake [internal h/brake]
    at the cost of 1600$$ cough cough choke then die .... THe disc is solid its not even vented for that cost !!

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    What about race glides

  9. #9
    Do you ever leave? EH179's Avatar
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    Hey swampy, only offered a suggestion champ!

    The rear brakes only do 30% of the work anyway, so why the need for big rear braking? Most rear disc's are solid unless you get custom.

    I reckon you are creating a headache for yourself, if you ever damage one of those modified axles.

    Good luck with your endeavour.

  10. #10
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    Hi
    Eh179
    As I said b4 its frustrating as everything is off the shelf only . Little or very close to nuth`n is made here ,frustrating . Little custom work actually happens .
    Agreed, the rears do not do a great deal. I WOULD NOT call VN commo brakes an upgrade compared to XA---xF / HZ rears .
    The sad part is there are guys/shops who make up diff units that make the diff pinion offset [suit axle brake combo] . IT MAY CAUSE A VIBRATION . YA Jokin right !!!!
    Many shops are just lazy, not to have a set of axles suitable or at least a blank .

    Vented rears ,special commos , XA--XF and probably others
    Rear large pads last & last so , when pad change required a caliper o/haul is typically needed .

    Puts a smile on my face every time !!!!
    The test would be to offer vn rear brakes to a guy with a XB GT never guna happen is it . LOL LOL

    TUf72
    yea thanks give em a call tomorrow


    JUST CHASIN CHOICE that's all
    Last edited by swampy; 19-11-2017 at 10:22 PM.

  11. #11
    Do you ever leave? paulzig's Avatar
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    Quote Originally Posted by Gregaust View Post
    Ok fair enough, maybe he doesn't like you lol . I found the exact opposite Sorry I bothered commenting now
    He likes me, I had a few quotes off him and 1 complete diff done... Its expensive yes, but its nicely done quality gear...

  12. #12
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    Quote Originally Posted by paulzig View Post
    He likes me, I had a few quotes off him and 1 complete diff done... Its expensive yes, but its nicely done quality gear...
    Same , The diff he did for me was absolutely perfect. Just the state of his workshop was enough of a indicator of the work he does
    Anyway .... Quality is remembered long after the cheap price

  13. #13
    been here .......too long Smitty2's Avatar
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    Quote Originally Posted by swampy View Post
    Aussie diffs does not make axles from blanks or otherwise. Off the shelf stuff only .
    They only do rear early commo brakes for early holdens . That's fine for smaller vehicles but fairly ineffective on larger cars .

    Vn commo rear pads are...... half the size ...... of HZ /WB rear [early falcon the same ]

    The brake balance of vn rears and HQ fronts would create a sizeable inbalance of the brake system I suspect .


    PROBABLY need to INCREASE rear brake pressure A HUGE amount to run rear commo vn installed on a HQ --WB
    ,,,,,,,,,,,,,
    there are 2 reasons for that... GMH do things for a reason

    HZ/WB rear brakes use the same pad for braking and park brake
    (all Commodores use a separate park brake with curved brake shoes 'in the hat')

    and weight... even the lightest 'Holden' Fisher body on a frame chassis weighs a lot more
    than the monocoque Commodore


    just for the record .....
    Last edited by Smitty2; 20-11-2017 at 09:57 PM.
    __________________________________
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  14. #14
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    Hi
    Yes I already understand about the integral/banksia brake style

    Vt commo around 1550 sedan ? -- 1700kg stato
    HQ sedan 1350 kg

    Interesting VT Holden went to only a slightly bigger than vn on the rear .
    Fluid Pressure to rear most likely be higher with the slightly larger pad to achieve good brake balance .
    The SPECIAL versions probably have vented disc plus big rear calipers .

    It all comes to balance ,the HQ must have a heavier bum/ rear end needing an upgraded rear brake capacity compared to commo.

    Same brakes were fitted to LTD with 9 inch . These same SPEC calipers are probably just a little overdone for a Holden. The rear brake pressure is probably A LITTLE lower in a HOLDEN .

    Back to VN ,I just remembered back in the 80`--90`s when jap cars started to play with rear disc a few were overworking rear rotors and causing brake shudder .
    Issue was to smaller brake setups and the little rear calipers were over working causing overheated rotors = excessive runout /wobbles . They were solid discs = no way to get rid of heat .

    So I am glad I refused to give in to the conversion ""specialists"" [ I use the term loosely ] .

  15. #15
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    My guess in regards to the size of HZ rear calipers/pads is more about what was available to use for the small volumes GMH would be using than what was the optimum size for perfect braking balance. In other words they had to buy something that was already available as the economies of scale wouldn't have allowed GMH to have spec'd a caliper/pad combo and have it made specifically for their (low volume) application. Keep in mind GMH used the same caliper on the rear disc option on UC Toranas too (I had one back in the day and I hate those rear calipers)

    If you look at rear drum set ups HQ and Commodore are similar size so I don't think HX-HZ had a specific need for a bigger caliper when compared to Commodores, if that was truly the case GMH would have went with smaller drums on the rear of Commodores.

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