chassis mod question

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chrome
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chassis mod question

Postby chrome » Sun Jul 21, 2013 8:29 pm

hey all, If I cut out a crossmember at the back of my chassis can I replace it by just welding in a new one or is that a cert job??
DIRTY OLD HILUX
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Fakey
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Re: chassis mod question

Postby Fakey » Sun Jul 21, 2013 8:31 pm

Im sure a man with your skills can make it look legit :mrgreen:
Didn't barbie drive a jeep??

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chrome
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Re: chassis mod question

Postby chrome » Sun Jul 21, 2013 8:33 pm

hmm not quite, what I want is pretty different to stock,
want a heavy box that I can mount recovery/tow bar kinda thing
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chrome
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Re: chassis mod question

Postby chrome » Mon Jul 22, 2013 6:49 pm

can anyone shed some light on this?
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Heath
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Re: chassis mod question

Postby Heath » Mon Jul 22, 2013 8:30 pm

I can find references to chassis mods and construction in the NZ hobby car technical manual.

The LVVTA website is crap. Cant search for the chapter on chassis mods (chapter 5) anywhere so you can get the right words (no point in me typing it in - too many words and diagrams and I don't have a scanner).

Sorry best I can do is you need chapter 5 section 4 Chassis modification and construction - crossmember attachment to production chassis.

Basically the new crossmember has to be attached in such a way as to reduce risk of cracking due to 'oil canning' of chassis wall. fish plates covering the full depth of the chassis would sort this. Make sure the fish plates don't have vertical edges which can be the source of cracking - tapered ends is best with radiused corners is best.

Hope that helps but if you are in Chch you can have a look at my book. Sorry I wont lend it out (cost me $250), but you are welcome to have a look.

Heath.

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kbushnz
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Re: chassis mod question

Postby kbushnz » Mon Jul 22, 2013 8:41 pm

Personally if I was in your shoes (and I have done it) As long as its welded well and looks factory.. And as you said heavier...
Just do it, get it covered in mud....
I would be more concerned with suspension attachment points and body mounts for ass covering.
Cheers Calvin
KZJ78 Landcruiser Prado...

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juz
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Re: chassis mod question

Postby juz » Mon Jul 22, 2013 9:11 pm

Yup I'm with calvin, paint it black throw some dust at it... Ohhh tht cross member mr wof man.. Been there for years etc.
as long as its solid, welded well and looks tidy go for it.
Softroader VW Amarok nowadays.... :roll:

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De-Ranged
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Re: chassis mod question

Postby De-Ranged » Mon Jul 22, 2013 11:36 pm

I talked to a certifier a while back about welding to the chassis for bumper mounts
"It requires cert... but is a grey enough area that so long as it is past (forward or back) any critical mounts its not worth certing...."
so.... so long as its past the rear cab mounts and not holding the tank then all good to add too...
Removing and replacing with non standard no mater if it doesn't have any structural attachments I'd see this as changing a chassis and would be cert
But a bit of mud really challanges warrant guys noticed they don't like to stand under muddy trucks for long :wink:

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chrome
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Re: chassis mod question

Postby chrome » Tue Jul 23, 2013 8:43 pm

all good, cheers guys, think il leave it in for now and bolt to it
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