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If you are building a Project vehicle you must have everything in writing.
First, everything you want to do on Form 1854 adding all the details of your build and then you will get Transports answer in what you can & cannot do, they will also tell you what Codes will be needed to get on the road.
If it is an easy question they will give you an answer over the phone, if more complex put it in writing (Form 1854). That way you have a paper trail.
To start here is Vehicle Standards (they make the rules for Transport) phone number if you wish to talk to them, I have always found them helpful when I have spoken to them. They are there to assist and guide you where possible 07 - 3114 5844.
That phone call could save you a lot of money & heartbreak.
I am even seeking approval for an engine swap into my GU - 6.6 Duramax, so if I get approval and when I can afford it I can then safely do the conversion. There are a lot out there with this conversion done with an LA1 (Engine Substitution) plate tossed on the firewall, this plate is no good unless you have that approval letter from Transport stating approval is given. This applies to all motors over 5.8lts going into full size 4wd's.
Keep the questions coming.
If I can make it a bit easier for people out there I feel I am having a win.