Home » Public Forums » GMCnet » [GMCnet] GMC body
| [GMCnet] GMC body [message #104882] |
Tue, 02 November 2010 20:29  |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
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Senior Member |
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I'm looking for opinions & comments ( good or bad ) regarding mounting a GMC coach body 2" higher than original though the use of a spacer or custom made tall frame rails.
Here are some of my good & bad reasons for considering this:
+More room above engine for aftermarket intake, FI, & floor insulation.
+Ability to raise fuel tanks to make room for a bottom sump to accommodate internal elect fuel pumps.
+Raised fuel tanks permits better under tank insulation.
+Raised holding tank & plumbing along with raised rear bumper gives better protection & departure angle at rear.
-Higher C of G may have a negative effect on handling.
-Steering shaft would need to be lengthened.
-Frame rails will be more visible from the side so custom side skirts might be desired.
Why you you might ask?
"because I can"
Actually I'm about to have a pair of replacement rails made up in the next month or so, and having them made 2" taller is no big deal.
I'm just looking for some convincing reasons for or against this idea before I order up the rails. Many of you have way more GMC smarts than I do, and might notice something I didn't.
Thanks
Les Burt
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] GMC body [message #104886 is a reply to message #104882] |
Tue, 02 November 2010 20:38  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Les,
Linwood Arthur did this with stretch that is up for sail currently in Texas.
Here's a link to his restoration:
http://www.gmcclassics.com/tech/larthur/lauther-rebuild.pdf
Regards,
Rob M.
USAussie
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
Sent: Tuesday, November 02, 2010 8:30 PM
To: Gmclist
Subject: [GMCnet] GMC body
I'm looking for opinions & comments ( good or bad ) regarding mounting a GMC
coach body 2" higher than original though the use of a spacer or custom made
tall frame rails.
Here are some of my good & bad reasons for considering this:
+More room above engine for aftermarket intake, FI, & floor insulation.
+Ability to raise fuel tanks to make room for a bottom sump to accommodate
internal elect fuel pumps.
+Raised fuel tanks permits better under tank insulation.
+Raised holding tank & plumbing along with raised rear bumper gives better
protection & departure angle at rear.
-Higher C of G may have a negative effect on handling.
-Steering shaft would need to be lengthened.
-Frame rails will be more visible from the side so custom side skirts might
be desired.
Why you you might ask?
"because I can"
Actually I'm about to have a pair of replacement rails made up in the next
month or so, and having them made 2" taller is no big deal.
I'm just looking for some convincing reasons for or against this idea before
I order up the rails. Many of you have way more GMC smarts than I do, and
might notice something I didn't.
Thanks
Les Burt
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] GMC body [message #104890 is a reply to message #104882] |
Tue, 02 November 2010 21:15 |
MikeT
Messages: 225
Registered: November 2009
Location: Marine City, Michigan
Karma: 0
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Les, where are you having your frame rails made and about how much $$?
Thanks
Mike Thomas
Marine City, MI
77 ex Palm Beach
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| Re: [GMCnet] GMC body [message #104898 is a reply to message #104890] |
Tue, 02 November 2010 23:39 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
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Senior Member |
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I found a shop here in Montreal that will laser cut all the holes and bend the rails to my specs. This shop has a 20ft CNC bending brake. Pricing still to be determined once I get a set of drawings to them.
I've been considering this upgrade for several months and I'm glad to hear that there are few if any negatives to doing so.
I came up with the idea of having some 8" tall rails made. (stock is ~ 6") I can then install the crossmembers and rear bumper frame offset to the top & the front subframe and bogie crossmember offset to the bottom of the rails. This gives a reasonable amount of additional ground clearance under the rear, but barely adds any additional weight. The frame will still look factory which is important to me as older vehicles around here tend to draw more attention in terms of safety inspections and major alteration scrutiny. The less obvious my upgrades look, the less attention I draw to my coach.
Les Burt
On 2010-11-02, at 10:15 PM, Thomas Mike <mthomas@wideopenwest.com> wrote:
>
>
> Les, where are you having your frame rails made and about how much $$?
>
> Thanks
> --
> Mike Thomas
> Troy, MI
> 77 Brown Palm Beach, thought it was an Eleganza II
> and 77 Purple Palm Beach
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] GMC body [message #104909 is a reply to message #104898] |
Wed, 03 November 2010 09:11 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Les,
If I've got this right I think you would mount the rear frame, cross
members, and front frame at the bottom of the new frame rails.
IIRC the only contact between the body and the frame are the blocks that sit
on the frame rails.
I think you'll have to put 2" spacers in between the body mounts and the
"tripods" that sit on the front frame on either side of the engine.
Regards,
Rob M.
USAussie
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
Sent: Tuesday, November 02, 2010 11:40 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] GMC body
I found a shop here in Montreal that will laser cut all the holes and bend
the rails to my specs. This shop has a 20ft CNC bending brake. Pricing still
to be determined once I get a set of drawings to them.
I've been considering this upgrade for several months and I'm glad to hear
that there are few if any negatives to doing so.
I came up with the idea of having some 8" tall rails made. (stock is ~ 6") I
can then install the crossmembers and rear bumper frame offset to the top &
the front subframe and bogie crossmember offset to the bottom of the rails.
This gives a reasonable amount of additional ground clearance under the
rear, but barely adds any additional weight. The frame will still look
factory which is important to me as older vehicles around here tend to draw
more attention in terms of safety inspections and major alteration scrutiny.
The less obvious my upgrades look, the less attention I draw to my coach.
Les Burt
On 2010-11-02, at 10:15 PM, Thomas Mike <mthomas@wideopenwest.com> wrote:
>
>
> Les, where are you having your frame rails made and about how much $$?
>
> Thanks
> --
> Mike Thomas
> Troy, MI
> 77 Brown Palm Beach, thought it was an Eleganza II
> and 77 Purple Palm Beach
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] GMC body [message #104920 is a reply to message #104909] |
Wed, 03 November 2010 11:00 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
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Senior Member |
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Rob,
Since the rear bogies bolt to the sides and bottom of the rails, the front subframe would also have to be located at the bottom edge to retain the correct chassis suspension geometry. As you stated, I would then need 2" spacers at the front tripod mounts to compensate for the 2" taller frame rails.
My thoughts on the crossmembers are that they would be best mounted up tight against the body floor like the original configuration. This also raises the fuel tanks since they mount to the crossmembers. By mounting the rear bumper frame to the top edge, the bumper retains it's stock look in relation to the body. The rear body mounts won't need spacers, and erxtra ground clearance is also gained at the rear improving access to inclined driveways.
Since the bogies also bolt to the bottom of the "H" member, I would have to have new frame doublers and a bogie crossmember made with the 2" taller height to match the rails. The other crossmembers that make up the "H" member can be re-used by locating them at the top edges.
That's about as far as I have gotten in terms of sorting this idea out. I will require a lot more of my time to sort out the smaller details, which I hope to before Xmas.
Les Burt
On 2010-11-03, at 10:11 AM, "Rob Mueller" <robmueller@iinet.net.au> wrote:
> Les,
>
> If I've got this right I think you would mount the rear frame, cross
> members, and front frame at the bottom of the new frame rails.
>
> IIRC the only contact between the body and the frame are the blocks that sit
> on the frame rails.
>
> I think you'll have to put 2" spacers in between the body mounts and the
> "tripods" that sit on the front frame on either side of the engine.
>
> Regards,
> Rob M.
> USAussie
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
> Sent: Tuesday, November 02, 2010 11:40 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] GMC body
>
> I found a shop here in Montreal that will laser cut all the holes and bend
> the rails to my specs. This shop has a 20ft CNC bending brake. Pricing still
> to be determined once I get a set of drawings to them.
>
> I've been considering this upgrade for several months and I'm glad to hear
> that there are few if any negatives to doing so.
>
> I came up with the idea of having some 8" tall rails made. (stock is ~ 6") I
> can then install the crossmembers and rear bumper frame offset to the top &
> the front subframe and bogie crossmember offset to the bottom of the rails.
> This gives a reasonable amount of additional ground clearance under the
> rear, but barely adds any additional weight. The frame will still look
> factory which is important to me as older vehicles around here tend to draw
> more attention in terms of safety inspections and major alteration scrutiny.
> The less obvious my upgrades look, the less attention I draw to my coach.
>
> Les Burt
>
> On 2010-11-02, at 10:15 PM, Thomas Mike <mthomas@wideopenwest.com> wrote:
>
>>
>>
>> Les, where are you having your frame rails made and about how much $$?
>>
>> Thanks
>> --
>> Mike Thomas
>> Troy, MI
>> 77 Brown Palm Beach, thought it was an Eleganza II
>> and 77 Purple Palm Beach
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
|
|
|
|
| Re: [GMCnet] GMC body [message #104933 is a reply to message #104920] |
Wed, 03 November 2010 13:49 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Les,
I agree 100% with paragraph 1 below.
You can bolt the rear sub frame and cross members up against the top of the
new frame rails, HOWEVER, that will not bring them into contact with the
bottom of the body BECAUSE the body sits on top of rubber blocks that sit on
top of the frame rails.
I just looked up under Double Trouble and verified that the cross members do
not contact the bottom of the body.
Regards,
Rob M.
USAussie
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
Sent: Wednesday, November 03, 2010 11:01 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] GMC body
Rob,
Since the rear bogies bolt to the sides and bottom of the rails, the front
subframe would also have to be located at the bottom edge to retain the
correct chassis suspension geometry. As you stated, I would then need 2"
spacers at the front tripod mounts to compensate for the 2" taller frame
rails.
My thoughts on the crossmembers are that they would be best mounted up tight
against the body floor like the original configuration. This also raises the
fuel tanks since they mount to the crossmembers. By mounting the rear bumper
frame to the top edge, the bumper retains it's stock look in relation to the
body. The rear body mounts won't need spacers, and erxtra ground clearance
is also gained at the rear improving access to inclined driveways.
Since the bogies also bolt to the bottom of the "H" member, I would have to
have new frame doublers and a bogie crossmember made with the 2" taller
height to match the rails. The other crossmembers that make up the "H"
member can be re-used by locating them at the top edges.
That's about as far as I have gotten in terms of sorting this idea out. I
will require a lot more of my time to sort out the smaller details, which I
hope to before Xmas.
Les Burt
On 2010-11-03, at 10:11 AM, "Rob Mueller" <robmueller@iinet.net.au> wrote:
> Les,
>
> If I've got this right I think you would mount the rear frame, cross
> members, and front frame at the bottom of the new frame rails.
>
> IIRC the only contact between the body and the frame are the blocks that
sit
> on the frame rails.
>
> I think you'll have to put 2" spacers in between the body mounts and the
> "tripods" that sit on the front frame on either side of the engine.
>
> Regards,
> Rob M.
> USAussie
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
> Sent: Tuesday, November 02, 2010 11:40 PM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] GMC body
>
> I found a shop here in Montreal that will laser cut all the holes and bend
> the rails to my specs. This shop has a 20ft CNC bending brake. Pricing
still
> to be determined once I get a set of drawings to them.
>
> I've been considering this upgrade for several months and I'm glad to hear
> that there are few if any negatives to doing so.
>
> I came up with the idea of having some 8" tall rails made. (stock is ~ 6")
I
> can then install the crossmembers and rear bumper frame offset to the top
&
> the front subframe and bogie crossmember offset to the bottom of the
rails.
> This gives a reasonable amount of additional ground clearance under the
> rear, but barely adds any additional weight. The frame will still look
> factory which is important to me as older vehicles around here tend to
draw
> more attention in terms of safety inspections and major alteration
scrutiny.
> The less obvious my upgrades look, the less attention I draw to my coach.
>
> Les Burt
>
> On 2010-11-02, at 10:15 PM, Thomas Mike <mthomas@wideopenwest.com> wrote:
>
>>
>>
>> Les, where are you having your frame rails made and about how much $$?
>>
>> Thanks
>> --
>> Mike Thomas
>> Troy, MI
>> 77 Brown Palm Beach, thought it was an Eleganza II
>> and 77 Purple Palm Beach
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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| Re: [GMCnet] GMC body [message #105091 is a reply to message #104933] |
Thu, 04 November 2010 20:20 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
Karma: 0
|
Senior Member |
|
|
Rob,
I knew that already, but chose my wording very poorly.
Actually, on my coach the crossmembers did touch the body in a few places but only because the rubber pads were due for replacement and the floor insulation had sagged in a few spots.
Thanks for being as helpful as you are to this group of fine people. It is mainly because of the efforts & willingness to share from all of the knowledgeable people here that our GMCs survive!!
Les Burt
On 2010-11-03, at 2:49 PM, "Rob Mueller" <robmueller@iinet.net.au> wrote:
> Les,
>
> I agree 100% with paragraph 1 below.
>
> You can bolt the rear sub frame and cross members up against the top of the
> new frame rails, HOWEVER, that will not bring them into contact with the
> bottom of the body BECAUSE the body sits on top of rubber blocks that sit on
> top of the frame rails.
>
> I just looked up under Double Trouble and verified that the cross members do
> not contact the bottom of the body.
>
> Regards,
> Rob M.
> USAussie
>
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
> Sent: Wednesday, November 03, 2010 11:01 AM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] GMC body
>
> Rob,
> Since the rear bogies bolt to the sides and bottom of the rails, the front
> subframe would also have to be located at the bottom edge to retain the
> correct chassis suspension geometry. As you stated, I would then need 2"
> spacers at the front tripod mounts to compensate for the 2" taller frame
> rails.
>
> My thoughts on the crossmembers are that they would be best mounted up tight
> against the body floor like the original configuration. This also raises the
> fuel tanks since they mount to the crossmembers. By mounting the rear bumper
> frame to the top edge, the bumper retains it's stock look in relation to the
> body. The rear body mounts won't need spacers, and erxtra ground clearance
> is also gained at the rear improving access to inclined driveways.
>
> Since the bogies also bolt to the bottom of the "H" member, I would have to
> have new frame doublers and a bogie crossmember made with the 2" taller
> height to match the rails. The other crossmembers that make up the "H"
> member can be re-used by locating them at the top edges.
>
> That's about as far as I have gotten in terms of sorting this idea out. I
> will require a lot more of my time to sort out the smaller details, which I
> hope to before Xmas.
>
>
> Les Burt
>
>
>
> On 2010-11-03, at 10:11 AM, "Rob Mueller" <robmueller@iinet.net.au> wrote:
>
>> Les,
>>
>> If I've got this right I think you would mount the rear frame, cross
>> members, and front frame at the bottom of the new frame rails.
>>
>> IIRC the only contact between the body and the frame are the blocks that
> sit
>> on the frame rails.
>>
>> I think you'll have to put 2" spacers in between the body mounts and the
>> "tripods" that sit on the front frame on either side of the engine.
>>
>> Regards,
>> Rob M.
>> USAussie
>>
>> -----Original Message-----
>> From: gmclist-bounces@temp.gmcnet.org
>> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
>> Sent: Tuesday, November 02, 2010 11:40 PM
>> To: gmclist@temp.gmcnet.org
>> Subject: Re: [GMCnet] GMC body
>>
>> I found a shop here in Montreal that will laser cut all the holes and bend
>> the rails to my specs. This shop has a 20ft CNC bending brake. Pricing
> still
>> to be determined once I get a set of drawings to them.
>>
>> I've been considering this upgrade for several months and I'm glad to hear
>> that there are few if any negatives to doing so.
>>
>> I came up with the idea of having some 8" tall rails made. (stock is ~ 6")
> I
>> can then install the crossmembers and rear bumper frame offset to the top
> &
>> the front subframe and bogie crossmember offset to the bottom of the
> rails.
>> This gives a reasonable amount of additional ground clearance under the
>> rear, but barely adds any additional weight. The frame will still look
>> factory which is important to me as older vehicles around here tend to
> draw
>> more attention in terms of safety inspections and major alteration
> scrutiny.
>> The less obvious my upgrades look, the less attention I draw to my coach.
>>
>> Les Burt
>>
>> On 2010-11-02, at 10:15 PM, Thomas Mike <mthomas@wideopenwest.com> wrote:
>>
>>>
>>>
>>> Les, where are you having your frame rails made and about how much $$?
>>>
>>> Thanks
>>> --
>>> Mike Thomas
>>> Troy, MI
>>> 77 Brown Palm Beach, thought it was an Eleganza II
>>> and 77 Purple Palm Beach
>>> _______________________________________________
>>> GMCnet mailing list
>>> List Information and Subscription Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
|
|
|
|
| Re: [GMCnet] GMC body [message #105123 is a reply to message #105091] |
Fri, 05 November 2010 09:05 |
|
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Bert,
You're welcome!
I was down a GEMRECS yesterday and was looking at a frame he had there. I
agree that you're going to have to do something to make the end pieces of
the cross members fill the ID of the 8" frame rails.
I like "helping out."
Regards,
Rob M.
USAussie
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
Sent: Thursday, November 04, 2010 8:21 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] GMC body
Rob,
I knew that already, but chose my wording very poorly.
Actually, on my coach the crossmembers did touch the body in a few places
but only because the rubber pads were due for replacement and the floor
insulation had sagged in a few spots.
Thanks for being as helpful as you are to this group of fine people. It is
mainly because of the efforts & willingness to share from all of the
knowledgeable people here that our GMCs survive!!
Les Burt
On 2010-11-03, at 2:49 PM, "Rob Mueller" <robmueller@iinet.net.au> wrote:
> Les,
>
> I agree 100% with paragraph 1 below.
>
> You can bolt the rear sub frame and cross members up against the top of
the
> new frame rails, HOWEVER, that will not bring them into contact with the
> bottom of the body BECAUSE the body sits on top of rubber blocks that sit
on
> top of the frame rails.
>
> I just looked up under Double Trouble and verified that the cross members
do
> not contact the bottom of the body.
>
> Regards,
> Rob M.
> USAussie
>
>
> -----Original Message-----
> From: gmclist-bounces@temp.gmcnet.org
> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
> Sent: Wednesday, November 03, 2010 11:01 AM
> To: gmclist@temp.gmcnet.org
> Subject: Re: [GMCnet] GMC body
>
> Rob,
> Since the rear bogies bolt to the sides and bottom of the rails, the front
> subframe would also have to be located at the bottom edge to retain the
> correct chassis suspension geometry. As you stated, I would then need 2"
> spacers at the front tripod mounts to compensate for the 2" taller frame
> rails.
>
> My thoughts on the crossmembers are that they would be best mounted up
tight
> against the body floor like the original configuration. This also raises
the
> fuel tanks since they mount to the crossmembers. By mounting the rear
bumper
> frame to the top edge, the bumper retains it's stock look in relation to
the
> body. The rear body mounts won't need spacers, and erxtra ground clearance
> is also gained at the rear improving access to inclined driveways.
>
> Since the bogies also bolt to the bottom of the "H" member, I would have
to
> have new frame doublers and a bogie crossmember made with the 2" taller
> height to match the rails. The other crossmembers that make up the "H"
> member can be re-used by locating them at the top edges.
>
> That's about as far as I have gotten in terms of sorting this idea out. I
> will require a lot more of my time to sort out the smaller details, which
I
> hope to before Xmas.
>
>
> Les Burt
>
>
>
> On 2010-11-03, at 10:11 AM, "Rob Mueller" <robmueller@iinet.net.au> wrote:
>
>> Les,
>>
>> If I've got this right I think you would mount the rear frame, cross
>> members, and front frame at the bottom of the new frame rails.
>>
>> IIRC the only contact between the body and the frame are the blocks that
> sit
>> on the frame rails.
>>
>> I think you'll have to put 2" spacers in between the body mounts and the
>> "tripods" that sit on the front frame on either side of the engine.
>>
>> Regards,
>> Rob M.
>> USAussie
>>
>> -----Original Message-----
>> From: gmclist-bounces@temp.gmcnet.org
>> [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Les Burt
>> Sent: Tuesday, November 02, 2010 11:40 PM
>> To: gmclist@temp.gmcnet.org
>> Subject: Re: [GMCnet] GMC body
>>
>> I found a shop here in Montreal that will laser cut all the holes and
bend
>> the rails to my specs. This shop has a 20ft CNC bending brake. Pricing
> still
>> to be determined once I get a set of drawings to them.
>>
>> I've been considering this upgrade for several months and I'm glad to
hear
>> that there are few if any negatives to doing so.
>>
>> I came up with the idea of having some 8" tall rails made. (stock is ~
6")
> I
>> can then install the crossmembers and rear bumper frame offset to the top
> &
>> the front subframe and bogie crossmember offset to the bottom of the
> rails.
>> This gives a reasonable amount of additional ground clearance under the
>> rear, but barely adds any additional weight. The frame will still look
>> factory which is important to me as older vehicles around here tend to
> draw
>> more attention in terms of safety inspections and major alteration
> scrutiny.
>> The less obvious my upgrades look, the less attention I draw to my coach.
>>
>> Les Burt
>>
>> On 2010-11-02, at 10:15 PM, Thomas Mike <mthomas@wideopenwest.com> wrote:
>>
>>>
>>>
>>> Les, where are you having your frame rails made and about how much $$?
>>>
>>> Thanks
>>> --
>>> Mike Thomas
>>> Troy, MI
>>> 77 Brown Palm Beach, thought it was an Eleganza II
>>> and 77 Purple Palm Beach
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Regards,
Rob M. (USAussie)
The Pedantic Mechanic
Sydney, Australia
'75 Avion - AUS - The Blue Streak TZE365V100428
'75 Avion - USA - Double Trouble TZE365V100426
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