Home » Public Forums » GMCnet » [GMCnet] Building the GMC to sell. Shimming the rear suspention.
| [GMCnet] Building the GMC to sell. Shimming the rear suspention. [message #333376] |
Tue, 12 June 2018 00:16  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Exterior paint work is complete. Looks great. Next. Changing the rear suspension to a rebuilt 78 unit. So what shims should I use. The machined housings should all be extremely close. The shims are more then likely to match variations in the main frame. So use the shims that are with the frame. Think it might be simpler to pull the gas tanks, and exhaust systems before the suspension. As I'm putting in new tanks, and exhaust anyway. Thinking of a new holding tank also. This is going to make someone a great GMC. Bob Dunahugh
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| Re: [GMCnet] Building the GMC to sell. Shimming the rear suspention. [message #333379 is a reply to message #333378] |
Tue, 12 June 2018 05:26  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Fred,
You should see Maintenance Manual X-7525, Section 4 - Rear Suspension, Page 4 - 32 & 4 -33, - On Vehicle Adjustments / Rear Wheel
Alignment, Paragraphs: Toe-In Measurements, Toe-In Adjustment, Rear Wheel Camber. Figure 67-Rear Wheel Alignment Chart and Figure
68-Rear Wheel Shim Location.
Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@list.gmcnet.org] On Behalf Of Fred
Sent: Tuesday, June 12, 2018 2:16 AM
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Building the GMC to sell. Shimming the rear suspention.
you should do a blog with photos Jim Bounds style! where are these rear shims located? are they alignment shims?
you must really enjoy wrenching on the GMCs.. not many would restore any old vehicle just to turn around and sell it!
good luck with it.
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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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| Re: [GMCnet] Building the GMC to sell. Shimming the rear suspention. [message #333383 is a reply to message #333379] |
Tue, 12 June 2018 05:59 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Bob,
Rob's right: You need to refer to the manual. You're going to need
alignment jigs.
You're probably going to find what I did when I rebuilt my bogies in '98:
The shims are nothing more than piles of rust. They were originally stacks
of thin steel, providing lots of surface area for rust. I wound up
estimating their thicknesses and replacing them with, mostly, 1/8" bar
stock. I've never really attempted to determine how well I did, but the
toe and camber (after some Jim Bounds bending) are all good, as is tire
wear.
Ken H.
On Tue, Jun 12, 2018 at 6:27 AM Rob Mueller wrote:
> Fred,
>
> You should see Maintenance Manual X-7525, Section 4 - Rear Suspension,
> Page 4 - 32 & 4 -33, - On Vehicle Adjustments / Rear Wheel
> Alignment, Paragraphs: Toe-In Measurements, Toe-In Adjustment, Rear Wheel
> Camber. Figure 67-Rear Wheel Alignment Chart and Figure
> 68-Rear Wheel Shim Location.
>
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Building the GMC to sell. Shimming the rear suspention. [message #333390 is a reply to message #333383] |
Tue, 12 June 2018 08:30 |
sgltrac
Messages: 2797
Registered: April 2011
Karma: 1
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I believe the bogie shims are primarily for camber as the ones I removed
from my 77 were along the top mounts only. Assuming no bent frame or arms
camber is likely the only adjustment needed at the rears. As Ken H stated
toe can be adjusted with pushing or pulling on the arm(s) in question.
Sully
Bellevue.
On Tue, Jun 12, 2018 at 4:00 AM Ken Henderson
wrote:
> Bob,
>
> Rob's right: You need to refer to the manual. You're going to need
> alignment jigs.
>
> You're probably going to find what I did when I rebuilt my bogies in '98:
> The shims are nothing more than piles of rust. They were originally stacks
> of thin steel, providing lots of surface area for rust. I wound up
> estimating their thicknesses and replacing them with, mostly, 1/8" bar
> stock. I've never really attempted to determine how well I did, but the
> toe and camber (after some Jim Bounds bending) are all good, as is tire
> wear.
>
> Ken H.
>
> On Tue, Jun 12, 2018 at 6:27 AM Rob Mueller
> wrote:
>
>> Fred,
>>
>> You should see Maintenance Manual X-7525, Section 4 - Rear Suspension,
>> Page 4 - 32 & 4 -33, - On Vehicle Adjustments / Rear Wheel
>> Alignment, Paragraphs: Toe-In Measurements, Toe-In Adjustment, Rear Wheel
>> Camber. Figure 67-Rear Wheel Alignment Chart and Figure
>> 68-Rear Wheel Shim Location.
>>
>>
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Sully
77 Royale basket case.
Future motorhome land speed record holder(bucket list)
Seattle, Wa.
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| Re: [GMCnet] Building the GMC to sell. Shimming the rear suspention. [message #333395 is a reply to message #333376] |
Tue, 12 June 2018 10:19 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Fred. It's a really nice GMC. That was on it's way to become a nice looking chicken coop in Iowa . It came with all new appliances that were still in boxes. Roof A/C, Frig, Furnace, And Magic chef cook top. All new cushion/seat redone, and window treatments. All still in bags. A nice paint job, and a good 455. Bob Dunahugh
________________________________
From: Bob Dunahugh
Sent: Tuesday, June 12, 2018 12:16 AM
To: gmclist@list.gmcnet.org
Subject: Building the GMC to sell. Shimming the rear suspention.
Exterior paint work is complete. Looks great. Next. Changing the rear suspension to a rebuilt 78 unit. So what shims should I use. The machined housings should all be extremely close. The shims are more then likely to match variations in the main frame. So use the shims that are with the frame. Think it might be simpler to pull the gas tanks, and exhaust systems before the suspension. As I'm putting in new tanks, and exhaust anyway. Thinking of a new holding tank also. This is going to make someone a great GMC. Bob Dunahugh
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| Re: [GMCnet] Building the GMC to sell. Shimming the rear suspention. [message #333425 is a reply to message #333423] |
Tue, 12 June 2018 16:33 |
James Hupy
Messages: 6806
Registered: May 2010
Karma: -62
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Also in the master parts manual, " as required". Some need more , some
less, some none. You have to drive it, and then pull straight into an
alignment area. Then establish correct tire pressures and ride height.
Then, measure camber and toe on the rear 4. Shim as required to conform to
manual specifics. Bending of bogie arms is sometimes required. Sometimes,
nothing is required, but not often in my experience. Especially on the
passenger side forward bogie. Nearly always bent
inward towards the frame.
Jim Hupy
On Tue, Jun 12, 2018, 2:23 PM Fred wrote:
> book show shims to adjust camber and toe, both horizontal and vertical
> ones that slip in between frame and bogie mounts. no mention of a special
> jig
> to install them?
>
>
> BobDunahugh wrote on Tue, 12 June 2018 10:19
>> Fred. It's a really nice GMC. That was on it's way to become a nice
> looking chicken coop in Iowa . It came with all new appliances that were
>> still in boxes. Roof A/C, Frig, Furnace, And Magic chef cook top. All
> new cushion/seat redone, and window treatments. All still in bags. A nice
>> paint job, and a good 455. Bob Dunahugh
>
>
>
> sounds like a nice find. was something wrong with it that foiled the
> previous owners plans or they passed away?
>
>
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| Re: [GMCnet] Building the GMC to sell. Shimming the rear suspention. [message #333430 is a reply to message #333376] |
Tue, 12 June 2018 23:24 |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
Karma: 11
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Senior Member |
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Thanks for the input. I'm going to start with the shim that are on the frame. Then check alignment. Bob Dunahugh
________________________________
From: Bob Dunahugh
Sent: Tuesday, June 12, 2018 12:16 AM
To: gmclist@list.gmcnet.org
Subject: Building the GMC to sell. Shimming the rear suspention.
Exterior paint work is complete. Looks great. Next. Changing the rear suspension to a rebuilt 78 unit. So what shims should I use. The machined housings should all be extremely close. The shims are more then likely to match variations in the main frame. So use the shims that are with the frame. Think it might be simpler to pull the gas tanks, and exhaust systems before the suspension. As I'm putting in new tanks, and exhaust anyway. Thinking of a new holding tank also. This is going to make someone a great GMC. Bob Dunahugh
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