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  1. #1
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    Default What the ozzy diff makers dont tell ya . A few traps .

    HI
    My experience with 9 inch diff builders in this country .

    1st Communication can be an issue incorrect or not enough information especially when trying to design assemble a 700hp diff with a housing that's only a stock replacement WTF u ask ..
    My assumption were all housings had inserted tubes not so
    The trap is some brands do some donot in the hotrod style

    2ND no body builds a housing for 700hp outa seamed tube YES MOST DO
    After looking at web site tube is not stated either way pic does not show seam at all .
    Clearly not a minimum standard
    None of the diff brand names in USA use seam tube its ONLY SUPERIOR seamless apparently far stronger .

    3rd
    Only gonna use what they can get there hands on ,little or no effort made to purchase desired part. LAZY
    Occurred with drain plug QUote lets fit a sump plug pointing straight down WTF !!!!!!!!!!!
    {large ugly poor sealing ,unable to jack,damage may occur]
    For a street car a flush type fitting plug a 5/7 O`clock

    Ring and pinion . US gear now make 3 street gear versions and 1 drag gear set of the same ratio.
    Lazy importers and shops are not aware and murder u and your family for """special orders""

    4th Ready to run --assuming clean NOPE 1x large teaspoon of grinder 36 grit Lovely WTF

    5th the supplied screw in studs --only to be retained by Red loktight WTF its a Street car

    6th I purchased car studs for the shop then they were incorrectly installed . Could not fit a disc or wheel on . Excess metal behind stud .

    7th tubes had been used or welded B4 .. There was a weld puddle evident

    8 th The previous welding had been very roughly ground away . This causes powder coating problems as the grind marks are deep . Spent a few hours refinishing grind mark = barely noticeable

    9 th Bearing plates that tight they are bent, tightened for transport . To get end float they MUST BE dead flat= Replaced Had to replace brg set also

    10th Shop was going to send base model diff centre yet it was in the quote what type Race case

    11th some shops will cheapen all your items to make a buck . If u donot pick it u get stung ……….

    12th Holden upper housing mounts
    Shop was going to use Old factory arms cut and weld WTF
    Water jet cut was the solution . Bushes had to be loktighted in / used shaft lock .


    I would get a different shop next time
    Summary is I would get McDonald bros racing to do any future work .They were my second choice . Only because he could supply particular axles. CHECK IF HE WILL USE OTHER PARTS then its ok .

    Many cheaper housings donot have full tube engagement
    The cheaper housings donot have internal bracing
    The cheaper housings cannot fully weld the inserted tube
    Most , even quality shops will use the inferior Chinese copy unless u ask

    I am sure there`s more but Currie and Strange are the only ones I would consider .

    DONT ACCEPT BULLSHIT SERVICE very very common

    Next housing will be HD case and SEAMLESS tubes welded into case from Strange Engineering
    The pathetic part is it would have been only 500$ more maybe if that .
    Now I have to build another housing
    Seeya

    Hope this helps someone
    Last edited by swampy; 14-11-2018 at 09:16 PM.

  2. #2
    Do you ever leave? EH179's Avatar
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    We live and learn, Swampy.
    Good information for the next crop of tinkerers.

  3. #3
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    I had a diff built for my EH, with problems, so I know your pain,mind you I had to send it back from the NT back to Melbourne twice at my expense and it was still a total piece of shite,I bit the bullet and just had it rebuilt for a 3rd time and ended up costing over 5g,mind you the old bw has a nice set of 31 spline billet axles,Harrop trutrac with 4.11 gears, so will see the end of the life of the car.
    I went the cheaper option/company at the time and it has cost me a bloody fortune,nobody would believe me that I have spent 10g on this diff and it is only a borgwarner.

  4. #4
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    Hi
    Yup …….
    99% of those issues I had were incompetence by place of business . Some issues were clear evidence of absolute laziness eg not checking work and lack of pride .
    Fairly easy to blow out then wash out inside housing and spray with CRC to prevent surface rust
    Being able to fit wheel over studs fairly important ya think !!!!!!!!! Machined excess metal

    Decent breather should be
    1 Holden wobble head available as Currie breather from Rocket [donot use the brass gauze these can block ]
    2 threaded nipple so u can run a hose to body

    Drain plug
    Use the grub screw BSP/NPT screw in to weld in bung . Made from Steel from Rocket as a set .

    Press in wheel studs available from NICE Products via distributors

    Hq suspension mounts for sedan
    All new from McDonald bros / Ultra 9 / various sources
    Caution on the upper mount design
    Last edited by swampy; 14-11-2018 at 09:09 PM.

  5. #5
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    Hi
    Koeh

    I see u had vibration issues with yours ..

    U mentioned diff pinion not being centred . I rang Mark Williams [google] and many cars are offset pinions . EG supposedly mine is 10mm . Wont cause vibration .
    In regards to gearbox /diff angle 1-3 degrees . As the load changes on the diff its set up to 1 side of the spec then loading to the other . Info from MW as well.
    I ask my diff guy and I will not need adjustable upper arms if the diff has been welded/setup properly to start with .

    What ended up being your issues ???
    offset /tshaft balance etc etc

  6. #6
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    Hi swampy,

    It is not the offset of the pinion that’s the problem it is the tailshaft/pinion angles that just aren’t quite right,mind you all the things that were wrong with the diff wouldn’t have helped.
    Put it this way the only thing that was able to be salvaged was the centre housing,so I went overboard and upgraded the lot,note to self don’t go the cheaper option (G & J differental services in Dandenong) cause it will cost you a shite load of money to get it fixed and a lot of frustration, I couldn’t have stuffed it up more if I done the shortening of the diff myself
    Last edited by koeh; 19-11-2018 at 07:45 AM.

  7. #7
    Do you ever leave? EH179's Avatar
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    Yeah... hindsight is a wonderful thing.

    Aussie Diffs at Currumbin, Gold Coast would have given a better product for the money, and they are closer to you, saving freight costs.

    I got them to build a 31 spline, full spool, 3.89 geared BW diff for less than 2K and can't fault it.

    A mate that owns a 10.2 second LJ Torana with a similar setup, endorses them also.

  8. #8
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    HI
    Aussie diff cannot do full custom axles . The reason I did not go there .
    BEAWARE OF SHOPS THAT WANT TO SELL U THERE REAR DISC KIT AND ARE NOT PREPARRED TO USE YOURS = Aussie diff were just one of many who did this



    What to Look for in a diff shop
    1/ full custom axles
    2/have access to any parts not just there stock very very important shows flexibility
    3/ very very good communication and explanations to you the customer
    4/answers the phone and calls back 99% time
    5/ does give u the full range of pricing --makes an effort with quoting
    6/ fully equipped workshop eg CNC machines and robot welding

    The ozzy diff industry has a lot of pretenders operating within it buyer be very aware


    www.aikman.com.au/home.html This company seems to be worth investigating OPINIONS ???
    Last edited by swampy; 19-11-2018 at 09:31 AM.

  9. #9
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    Wow sad story. Ive had the same diff guy for ever. When someone comes well recommended it's because he's good.

  10. #10
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    Steelie?

  11. #11
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    Mine was built years ago by a guy now out of business. All he did was race car fabrication (mostly drag cars). Custom shortened 9", 35 spline axles, Strange Detroit Locker centre, full floater hubs, my own disc brake set up etc. Cost me over $4K but the thing is rock solid. And yeah seamless tubes was the very first conversation we had
    Chris

    68 Camaro 632 BBC Pro-touring

    Daily driver - 1961 Buick Bubbletop - not much horsepower, but smiles for miles

  12. #12
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    HI
    All ,surely diff businesses cannot be like this but donot go to a high profile diff business in Brizzy.
    In an effort to rectify all of above a very small tool was ordered to fit in a SMALL post bag . All express post from the business house are 25$ [actual aust post cost 11 approx.]
    There explanation is they have to drop it at the post office .WTF

    No other place charges xtra for this service I deal with .

    Yes this was a diff place I did not pick thank God .


    I will give everyone the names once warranty has expired .

  13. #13
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    If making a buck is the primary goal than clipping the ticket at every available opportunity is a must. I can certainly accept that someone needs to be paid for time spent but I bet they didn't go to the post office for a single parcel.

  14. #14
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    HI
    I suppose it comes from my mechanical background of not seeing an inflated express post bag price ever in 35 yrs exp. If the seller cannot work out an overnight air xpress bag would be cheaper, they are beyond help . Then this just shows u how much the business cares in keeping the prices contained for the customer . More to the point lack of care .


    I have been until recently do to ill health been in business many years and would never charge unreasonably . Not against people making profit but ethically .

  15. #15
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    Over inflated shipping costs seem to have become the norm these days rather than the exception, it's rife on ebay etc and seems it's rearing it's ugly head in local suppliers.

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