WB chassis under a HQ

**HK1837** · 07-06-2015, 10:45 AM

The chassis is the legal and ADR compliance identity of the vehicle. So a HQ with a WB chassis becomes a WB (AWB, BWB, CWB etc). Therefore to the letter of the law the vehicle must comply with all ADR's applicable to the vehicle the chassis came from. Which means more than pollution requirements. Technically you'd have to get the HQ body modified and Engineered for retractable seat belts, you'd have to change blinkers, comply with black wipers, probably change at least the dash warning lights for brakes. It may even mean changing the dash if there is any ADR's that mean you cannot have a steel dash in front of you.

This is what makes a joke of the stupid laws about changing ID plates - in theory the way to do the chassis change properly is to use the ID plates off the vehicle the chassis came from, as those plates tell you the ADR's the vehicle complies with.

**Big Rob** · 09-06-2015, 02:06 AM

Yeah, it's a dumb rule, but the one we have to live with.

HK, what's the difference between ADR 27a and b?

**HK1837** · 09-06-2015, 07:16 AM

I'm not sure as I've never really been all that interested in the ins and outs of Holden/Commodore etc after 1980. Dr Terry will probably have a better idea.

**Big Rob** · 10-06-2015, 01:07 AM

Yeah, me neither. It's probably only some minor thing. My WB van is ADR 27b, not that I give a crap about that, but it's interesting to see the minor changes especially the ones to the engine emissions.

**wbute** · 10-06-2015, 08:12 AM

It tells you here if you care to read it.
http://rvcs-prodweb.dot.gov.au/Circu...rs/27b-1-1.pdf

**HK1837** · 10-06-2015, 09:45 AM

Looks like only evaporative emissions is different.

**Dr Terry** · 10-06-2015, 10:51 PM

I think many of these emission rules are now almost irrelevant.

AFAIK, the RMS (RTA) now look these rules as just being either pre-73 (no ADR27) or pre-1986 (pre-unleaded).

When you look at todays emission laws, Euro 4, Euro 5 etc. the difference between ADR27, 27a or 27b, becomes almost meaningless. Especially when you consider how many of these cars are still on the road, as a proportion of the total fleet.

I am currently going thru this stuff with a few certifying engineers, to get a handle on it. But even on the subject of chassis stampings, I don't think that the authorities are as draconian is you think they are.

Dr Terry

**Big Rob** · 11-06-2015, 12:35 AM

True Dr Terry. Most rego inspectors down my way don't even look at things like emissions or ADR's when doing the annual inspection on old cars. It seems that as you say, they only really focus on Pre unleaded and Post unleaded.
I've had a Holley, Edelbrock manifold, extractors, etc, etc,.... on my LX Torana for years and they don't even bat an eyelid. It's on Historic rego now, so that doesn't even get checked any more.

I think that as long as your numbers add up there's no real drama. Obviously as per the original topic, a WB chassis will change a few things, but I don't think it would affect rego with regard to ADR27a(b) any more.

**HK1837** · 11-06-2015, 08:13 AM

It will matter if you get defected and have to go to an RMS inspection station, or if you have to get it Engineered for example with a SBC. But as Dr Terry says it probably won't matter too much with normal blue slip or pink slip process.