GVM upgrade..what is required?

Submitted: Friday, Jun 04, 2010 at 21:11
ThreadID: 79073 Views:5957 Replies:4 FollowUps:5
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I have a LC 79 series cc 4.5 V8 and I reckon it is around 4 tonne loaded.

By the end of the year it will have behind it an ExploreX 20' offroad.....2.6T empty plus load...whatever that maybe!...so maybe 3 to 3.? T

What is involved for a GVm upgade?

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Reply By: blown4by - Friday, Jun 04, 2010 at 22:08

Friday, Jun 04, 2010 at 22:08
Modification to light production vehicle application to Dept of Transport Vehicle Safety Branch 21 Murray Road South, Welshpool. Form available on line at: www.transport.wa.gov.au/licensing then then then then look down the list to find the form.
You will then need a suspension upgrade, brake test and checklist from the light vehicle national code of practice (VSB14) which is also on line at the same address, signed of by a Transport accredited Engineer (list of Engineeers on the website) and then a roadworthy & identity check & re-assessment of the GVM at an Examination Centre who will issue a Mod Permit ($17.90) or if the modifier is part of the VSB6 modification scheme they will fit a mod plate and then a permit is not required then all is legal and insurable.
AnswerID: 419589

Reply By: Member - Tony V (NSW) - Friday, Jun 04, 2010 at 23:01

Friday, Jun 04, 2010 at 23:01

You may have a problem. with the weights you talk about 4 tonne and 3 plus tonne.

Changing GVM does not increase your GCM.

Gross Combined Mass for your 79 is 6800kg
This is made up of.
Kerb weight 2010kg
Payload of 1290kg
= 3300kg
Plus braked towing 3500kg
GCM = 6800kg.

If you change your GVM you will be restricted on what you can tow.

Kerb weight 2010kg
Upgrade GVM to 1990kg (extra 700kg)
= 4000kg
Towing capacity then would be 2800kg

GCM cannot be changed for any vehicle.

AnswerID: 419593

Follow Up By: lizard - Saturday, Jun 05, 2010 at 00:39

Saturday, Jun 05, 2010 at 00:39
GCM cannot be changed for any vehicle .... ? Not quite correct , it cannot be changed past manufacturers stated limit , unless chassis has been modified .
I have had my GU ute GCM (2005 4.2 itd) upgraded from ~ 5800 to 6200 kg (which is what the later model 3.0 litre utes are plated at ).... all approved , license from DPI reflects change .... signatory engineer did most of paper work for me
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Follow Up By: Member - Teege (NSW) - Saturday, Jun 05, 2010 at 00:46

Saturday, Jun 05, 2010 at 00:46
I'd also be asking what is included in the bare weight of the van. I find it interesting that their website doesn't disclose any weights apart from "Explorex vans weigh in under 2.5t so they can be towed by a utility". That sounds like caravan salesman talk to me! Does that include the awning and annexe, and the air conditioner, all of which are apparently standard equipment? How much water does it carry with the full size ensuite? In a van that size and construction I would expect your final gross weight to be well over 3 tonnes. BTW it looks like a great van.
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Follow Up By: Member - Tony V (NSW) - Saturday, Jun 05, 2010 at 20:11

Saturday, Jun 05, 2010 at 20:11
Thanks Lizard,

You are correct, as you said, yours is a manufactures spec upgrade (allowed under ADR) and a great upgrade for the 4.2TD it can certainly handle the extra with that engine.

What I find funny is that the 2005 4.2 TD wagon has a GCM of 6580kg ???

FollowupID: 689881

Follow Up By: lizard - Saturday, Jun 05, 2010 at 23:31

Saturday, Jun 05, 2010 at 23:31
Is that right ? never knew that .... not only funny , but a little strange too...so it's towing must be up around 3300 kg ?
FollowupID: 689910

Follow Up By: Member - Tony V (NSW) - Sunday, Jun 06, 2010 at 16:42

Sunday, Jun 06, 2010 at 16:42

4.2TD wagon can tow 3500kg manual

4.8 petrol wagon 3500KG manual and auto

3.0TD wagon 3200kg manual

3.0TD wagon 2500kg Auto

There is no consistancy.
Had a friend with the 3ltr auto who towed a 3 tonne van, had a bingle and insurance would not pay out. He changed from a 4.8 prtrol and thought it could tow 3.2 tonne, didn't realise that the auto was 2.5 tonne... nearly $80k lost.
FollowupID: 689979

Reply By: Member Dick (Int) - Saturday, Jun 05, 2010 at 20:51

Saturday, Jun 05, 2010 at 20:51
TJM have a kit already approved to increase the GVM of the LC79 and I am sure ARB also have one.

We have installed the TJM kit on both the LC79 and the LC78 and had an Engineer sign off on the Mod. N.S.W RTA accepted it without question.

I do not think there is any way to increase the GCM in the LC79, but one of the specialist company's like Multi Drive may be able to do it.

With the weights you are contemplating, you need to get Peter Koning to modify your brakes and your handbrake. The Toyota Brakes just do not cut it with an increased GVM.



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AnswerID: 419691

Reply By: Member - Norm C (QLD) - Saturday, Jun 05, 2010 at 22:02

Saturday, Jun 05, 2010 at 22:02
Like you, I carry and tow big loads. I have a 79 Series with an ARB upgrade to 3,700 KG. One of the suspension companies (Pedders???) has one to 3,800KG I think.

ARB changed all springs, shocks, shackles etc and did the certification and attached the mod plate.

I also have Boss airbags on the rear springs (bought the kit and installed myself).

To help on the power side, I have 3 inch Mandrel exhaust and DP Chip.

With the mods, the vehicle is a monster and handles the (sometimes) massive loads very well.

Norm C

AnswerID: 419700

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