| [GMCnet] 1974-1978 front frame comparison [message #183029] |
Mon, 03 September 2012 19:05  |
glwgmc
Messages: 1014
Registered: June 2004
Karma: 10
|
Senior Member |
|
|
Hi Les,
Thanks for posting these most interesting pictures. Perhaps these subtle changes help explain the different experiences we are hearing about as people install 1 ton front ends. The GMC manuals do not reflect any geometry differences year to year following the change from 3 degrees static caster in 73 lowered to 2 degrees in 75 and on, but while most people have installed the 1 ton with great results, a few have been fighting to get theirs to drive correctly. There is not much adjustment range in the upper A arm to effect camber and caster, but any change in where those brackets are located or where the adjustment slots are in relation to the ball joints could have a profound effect.
Jerry
Jerry Work
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
glwork@mac.com
http://jerrywork.com
541-592-5360
--------------------
Message: 10
Date: Mon, 3 Sep 2012 16:01:02 -0400
From: Les Burt <gmc.les@gmail.com>
Subject: [GMCnet] 1974 - 1978 Front Frame Comparison
To: gmclist@temp.gmcnet.org
Message-ID:
<CAKDALh1MoT-QHYGpYkYXrZFihQm_8TxMdWk9kVAwyBCpsezfeA@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
I've annotated and uploaded the Front Frame comparison photos. you can find
them here:
http://www.gmcmhphotos.com/photos/g6170-1974-1978-front-frame-comparison.html
----------------------
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Jerry & Sharon Work
78 Royale
Kerby, OR
|
|
|
|
| Re: [GMCnet] 1974-1978 front frame comparison [message #183035 is a reply to message #183029] |
Mon, 03 September 2012 19:38  |
 |
USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
|
Senior Member |
|
|
Jerry,
I thought it was the other way round? After 1975 it was easier to get more caster.
All Tom Hampton could get at 0° camber was 1.9° caster in Double Trouble WITH offset upper bushings!
I installed a set of Dave Lenzi's modified upper control arms and now I run 5° caster, 0 camber, 0 toe in/out.
I'm going to ask Jim Hupy to drive Double Trouble to assess it's handling and stopping. I think they're both very good but I have
only driven my two GMC's whereas he has driven many and has a larger frame of reference.
Regards,
Rob M.
-----Original Message-----
From: Work Jerry
Hi Les,
Thanks for posting these most interesting pictures. Perhaps these subtle changes help explain the different experiences we are
hearing about as people install 1 ton front ends. The GMC manuals do not reflect any geometry differences year to year following
the change from 3 degrees static caster in 73 lowered to 2 degrees in 75 and on, but while most people have installed the 1 ton with
great results, a few have been fighting to get theirs to drive correctly. There is not much adjustment range in the upper A arm to
effect camber and caster, but any change in where those brackets are located or where the adjustment slots are in relation to the
ball joints could have a profound effect.
Jerry
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List 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
|
|
|
|
| Re: [GMCnet] 1974-1978 front frame comparison [message #183054 is a reply to message #183035] |
Mon, 03 September 2012 22:03 |
John Sharpe
Messages: 489
Registered: February 2006
Location: Texas
Karma: 1
|
Senior Member |
|
|
| Quote: |
......I'm going to ask Jim Hupy to drive Double Trouble to assess it's handling and stopping. I think they're both very good but I have
only driven my two GMC's whereas he has driven many and has a larger frame of reference.
Regards,
Rob M.
|
Think I'll txt Helen to slip Jim H a $50 to lie. LOL! Have a wonderful trip, hope your B'day was great and see u in Amana.
John Sharpe
Humble,TX
'78 Eleganza TBI
'89 Spectrum 2000 MPI V-10
'40 Ford Panel Delivery TPI
johnasharpe@gmail.com
|
|
|
|
|
|
| Re: [GMCnet] 1974-1978 front frame comparison [message #183093 is a reply to message #183083] |
Tue, 04 September 2012 13:19 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
|
Senior Member |
|
|
Rob, we have arrived in Deadwood. Give me a call on the cell when you get
a chance. We are in a parking lot on the left side of the main drag, behind
the Hampton Inn.
On Sep 4, 2012 8:30 AM, "Rob Mueller" <robmueller@iinet.net.au> wrote:
> John,
>
> Thanks MATE!
>
> The B'day was great, every year you get to hang around on this planet
> after you retire is a bonus. At the end of this year it'll be
> 10 for me!
>
> THANKS for wanting me to become MORE paranoid about the way this thing
> drives, assuming you'll tell JimH to say it drives lousy! ;-)
>
> Have a safe trip up!
>
> Regards,
> Rob M.
>
> -----Original Message-----
> From: John Sharpe
>
> Think I'll txt Helen to slip Jim H a $50 to lie. LOL! Have a wonderful
> trip, hope your B'day was great and see u in Amana.
> --
> John
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
|
|
|
|
|
|
GMCforum
Search
Help
Register
Login
Home
