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Re: [GMCnet] Got Double Trouble weighed at a CAT Scale [message #182348 is a reply to message #182015] Thu, 30 August 2012 07:13 Go to previous messageGo to previous message
David Greenberg is currently offline  David Greenberg   United States
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Registered: September 2010
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Bill didn't GM T&C add gussets to the 78 chassis to accommodate an increase?

On Mon, Aug 27, 2012 at 8:07 PM, Bill Bryant <bryant374@earthlink.net> wrote:
>
>
> -----Original Message-----
> From: Bill Bryant
>
> Questions for the GMC Brain Trust:
>
> 1) Did GMC actually do anything to the suspension system to up the GAWR and GVWR or just "pencil whip it?"
>
> Rob,
>
> I am assembling some details on the 4 different GVWs used over the 6 years of production which will take me a little while (we have
> company and they are distracting me).
>
> I can tell this much now:
>
> I was told by one of the original Engineers that one of the increases was a "paper" change made per Kurdt Stubenvoll, the others
> resulted from changes in the product.
>
> The 4 different vintage parts books, Jan.1973 - 78Z show the same torsion bar part numbers for all years.
>
> --
> Bill
>>
>>
>
>
> I decided to consolidate some of the detail, sufficient for the posed question.
>
> GVWs
> 1973 = 10,500
> 1973 late = 11,200
> 1975 = 11,700
> 1978 = 12,500
>
> There were MANY changes spread throughout the production period, here are a few of those that likely apply to the GVW changes.
>
> 1973
> Rear brakes, backing plate, spindle & bearings
> front shocks and again in 1977
>
> Frame: Except for the side rails, all sections of the frame were changed at least once (1973 & ~75)
>
> Rear control arms, once for 1 1/4" bushings, once for 1 1/2" pins
>
> Front lower control arms changed 3 times.
>
> Radial tires & wheels @ 5V101674
>
> Body structure changed @ 6V100878 (body was part of frame/body load support design)
>
> As noted earlier, the same P/N torsion bar was used from
> 1973 through 1978.
>
> There is probably more, but this should do for now.
>
>
>
>
>
>
> --
> Bill Bryant
> 1976~PB
> 1914 Ford
> 1965 Corvette
> GMC MH History CD
> GMC Showroom Films DVD
> http://bdub.net/billbryant/
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--
David Lee Greenberg
Port St Lucie, FL
skype: david.lee.greenberg

http://www.picturetrail.com/gmcregistry
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