Registered my converted GU wrong and mod plate isn't required?
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Replacement engines that are offered by the manufacturer as an optional engine for that model of vehicle may be fitted without specific approval or the fitment of a modification plate. For such conversions, all components, including suspension and brakes, must be identical to those of a vehicle originally produced with the optional engine. No modification plate is required to be fitted.
This is where you can get trapped, as the conversion still needs to meet ADRs and Australian Standards etc, and normally with engine swaps, the new engine will need to meet the pollution requirements of what ever engine was the stricter rules/later model, as your 3L was from 2001, and TD's went up to about 2006, on paper i can't see why you really would need a mod plate.
Personally, id ring transport and explain the situation, i assume the workshop wrote down the new engine number on the roadworthy and so it would start with TD ? , explain the workshop did the conversion, and it meets the requirements for owner approved engine swaps (with regard to suspension and brakes etc) get that changed and tell them to email you a new copy of the rego papers, then email that to your insurance co so you have a paper trail.