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[GMCnet] Ride height [message #345666] Wed, 24 July 2019 11:07 Go to next message
Dean Hanson is currently offline  Dean Hanson   United States
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Registered: May 2018
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Jim H; You said that out of 25 coaches, only two had the correct height.

How does one determine the correct height?



Dean C. Hanson 75Avion

P.O.Box 2096

Fremont, Ca. 94536

(510) 657-9600



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Re: [GMCnet] Ride height [message #345668 is a reply to message #345666] Wed, 24 July 2019 11:33 Go to previous messageGo to next message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
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Senior Member
Read the appropriate technical manual for your coach, and the specs for
your coach will be listed. The FRAME RAILS are the most accurate places to
check ride height. There are FACTORY PLACED OVAL HOLES in the rails
directly behind the front tires as well as behind the rear tires. Specs are
given plus or minus a dimension expressed in fractions of inches to either
the center of the slot or the top of the slot.
The bottom of the bogie box, grease zerk, or top of the wheel wells
is NOT, I repeat, NOT an accurate place to measure for wheel alignment
purposes. Variables abound.
Many bench racers here will tell you different things that work for
them, and are "just as good" as factory specs.
They are entitled to their opinions. I personally use factory
dimensions established by the engineers that built the coach. Never steered
me astray yet, but, I have only 40 years or so of experience, so I could
learn different, yet.
I am presently in Petaluma, California. It is my newly acquired
stepdaughters birthday, and am away from my manuals. That is why I did not
mention exact dimensions. Will be home next week. If you contact me offnet
then, I will be happy to explain in greater detail.
Jim Hupy
Salem, Oregon

On Wed, Jul 24, 2019, 9:07 AM Dean Hanson via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Jim H; You said that out of 25 coaches, only two had the correct height.
>
> How does one determine the correct height?
>
>
>
> Dean C. Hanson 75Avion
>
> P.O.Box 2096
>
> Fremont, Ca. 94536
>
> (510) 657-9600
>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
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>
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Re: [GMCnet] Ride height [message #345669 is a reply to message #345666] Wed, 24 July 2019 11:41 Go to previous messageGo to next message
Matt Colie is currently offline  Matt Colie   United States
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
Senior Member
Dean Hanson wrote on Wed, 24 July 2019 12:07
Jim H; You said that out of 25 coaches, only two had the correct height.

How does one determine the correct height?

Dean C. Hanson 75Avion
Dean,

The subject is covered in the back of the GMC owners manual. You can download if you don't have it.

Measuring it is easy, but a pain. In most 26s one of the rear references is hidden by the generator mount.

Adjusting the rear is a minor pain if it is stock because you have to fiddle with the little lever.

Adjusting the front is a major PITA because you need the tool to unload the jack screw. If you try to adjust it loaded, I am told it will strip.

Oh, and yes, it takes three tries to adjust anything.....

Matt


Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
Re: [GMCnet] Ride height [message #345670 is a reply to message #345666] Wed, 24 July 2019 11:57 Go to previous messageGo to next message
Scott Nutter is currently offline  Scott Nutter   United States
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Registered: January 2015
Location: Houston/San Diego
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Senior Member
Front ride height to the top of the oval should be 13 1/8 inches +/- 1/4 inch.
Rear ride height to the top of the oval should be 11 11/16 inches +/- 1/4 inch.


Scott Nutter 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI Houston, Texas
Re: [GMCnet] Ride height [message #345671 is a reply to message #345670] Wed, 24 July 2019 12:15 Go to previous messageGo to next message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
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Senior Member
Ah yes, the fun begins, again. (Grin)
Jim Hupy

On Wed, Jul 24, 2019, 9:57 AM Scott Nutter via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Front ride height to the top of the oval should be 13 1/8 inches +/- 1/4
> inch.
> Rear ride height to the top of the oval should be 11 11/16 inches +/- 1/4
> inch.
>
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
> drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrera
> installed MSD Atomic EFI
> Houston, Texas
>
> _______________________________________________
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Re: [GMCnet] Ride height [message #345673 is a reply to message #345671] Wed, 24 July 2019 13:48 Go to previous messageGo to next message
tmsnyder is currently offline  tmsnyder   United States
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Registered: January 2014
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Senior Member
What's a typical pressure reading at the appropriate ride height? I'm seeing about 80psi, seems high for a 40 year old rubber bag.

Todd Snyder, Buffalo NY 1976 Eleganza II
Re: [GMCnet] Ride height [message #345674 is a reply to message #345673] Wed, 24 July 2019 13:53 Go to previous messageGo to next message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
Karma: 13
Senior Member
Your bag is not just rubber. It has layers of fabric in it.

My old bags and my new old stock bags both had about 80 to 90 psi at proper ride height

Emery Stora

> On Jul 24, 2019, at 12:48 PM, Todd Snyder via Gmclist wrote:
>
> What's a typical pressure reading at the appropriate ride height? I'm seeing about 80psi, seems high for a 40 year old rubber bag.
> --
> Todd Snyder, Buffalo NY
> 1976 Eleganza II
>
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Re: [GMCnet] Ride height [message #345676 is a reply to message #345674] Wed, 24 July 2019 14:26 Go to previous messageGo to next message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
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Senior Member
Weight distribution plays a role in basic initial ride height. Air bag
pressures can raise or lower the coach for purposes like draining waste
tanks or uneven campgrounds. Air pressure in late Royale 26 foot coaches
can be as much as 120 psi. in some instances. Usual travel ride height is
85-95 psi. Lighter coaches a bit less, heavy ones a bit more.
Also front ride height affects the rear.
Jim Hupy
Salem, Oregon

On Wed, Jul 24, 2019, 11:54 AM Emery Stora via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Your bag is not just rubber. It has layers of fabric in it.
>
> My old bags and my new old stock bags both had about 80 to 90 psi at
> proper ride height
>
> Emery Stora
>
>> On Jul 24, 2019, at 12:48 PM, Todd Snyder via Gmclist gmclist@list.gmcnet.org> wrote:
>>
>> What's a typical pressure reading at the appropriate ride height? I'm
> seeing about 80psi, seems high for a 40 year old rubber bag.
>> --
>> Todd Snyder, Buffalo NY
>> 1976 Eleganza II
>>
>> _______________________________________________
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>
>
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Re: [GMCnet] Ride height [message #345697 is a reply to message #345666] Thu, 25 July 2019 03:40 Go to previous messageGo to next message
Ken Burton is currently offline  Ken Burton   United States
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
Senior Member
When I bring my scales to a rally we usually weigh 20 to 25 coaches. We have done this at about 15 rall1es (mostly GMCMI, Dixielanders, and Eastern States). We have found about the same results. 2 or 3 out of the 20-25 are correct. Do not let this number bother you because people that have their coaches setup correctly do not usually present them for weighing.

On ride height, I have a set of blocks (measuring sticks) made out of 2x4s and 1x2s cut the the correct length to slide under the frame in front and rear. Also on the measuring sticks is a graduated scale so you can easily read how low they are. It is very rare to see one high unless they have crippled their air system with schrader and shut off valves, or the wireless air system. Front ones are never high. The reason for two different size measuring sticks is so you can not mistake which ones are front vs. rear. We take 4 guys each with a stick and as they pull in, measure their heights. It takes longer to write the numbers down than it take to read the sticks 30-35 seconds total for all 4. Then we pull ahead and weigh them.

I usually saw up a bunch of old 2x4s and 1x2s to the correct lengths and hand them out at rallies to people that want them. I do not have the length numbers in front of me. They are written the measuring blocks that are stored, along with my scales, at the airport. This method is sure a lot easier than measuring down frame From the frame holes.


Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

[Updated on: Thu, 25 July 2019 05:47]

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Re: [GMCnet] Ride height [message #345698 is a reply to message #345697] Thu, 25 July 2019 06:42 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
My measuring sticks for beneath the frame are similar to Ken B's except
that they're notched: I cut the stick to the distance from the ground to
the proper height beneath the frame in the front. Then, I cut 1/2 the
width down to the height at the rear. The 2" or so difference means
there's no confusion about which area to use when. SInce I usually need
them when setting ride heights, I want them to stand alone, so most are
made from 4x4's. I don't haul them around.

Using the measuring sticks for beneath the frame rather than to measure
from the tops of the prescribed oval holes also has the advantage that they
can be used at the left rear where the Onan obscures the hole.

JWID,

Ken H.

On Thu, Jul 25, 2019 at 4:41 AM Ken Burton via Gmclist <
gmclist@list.gmcnet.org> wrote:

> When I bring my scales to a rally we usually weight 20 to 25 coaches. We
> have done this at about 15 rallys (mostly GMCMI, Dixielanders, and Eastern
> States). We have found about the same results. 2 or 3 out of the 20-25
> are correct. Do not let this number bother you because people that have
> their coaches setup correctly do not usually present them for weighing.
>
> On ride height, I have a set of blocks (measuring sticks) made out of 2x4s
> and 1x2s cut the the correct length to slide under the frame in front and
> rear. Also on the measuring sticks is a graduated scale so you can easily
> read how low they are. It is very rare to see one high unless they have
> crippled their air system with schrader and shut off valves, or the
> wireless air system. Front ones are never high. The reason for two
> different
> size measuring sticks is so you can not mistake which ones are front vs.
> rear. We take 4 guys each with a stick and as they pull in, measure their
> heights. It takes longer to write the numbers down than it take to read
> the sticks 30-35 seconds total for all 4. Then we pull ahead and weigh
> them.
>
> I usually saw up a bunch of old 2x4s and 1x2s to the correct lengths and
> hand them out at rallies to people that want them. I do not have the
> length
> numbers in front of me. They are written the measuring blocks that are
> stored, along with my scales, at the airport. This method is sure a lot
> easier than measuring down frame From the frame holes.
> --
> Ken Burton - N9KB
> 76 Palm Beach
> Hebron, Indiana
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] Ride height [message #345700 is a reply to message #345698] Thu, 25 July 2019 08:10 Go to previous messageGo to next message
James Hupy is currently offline  James Hupy   United States
Messages: 6806
Registered: May 2010
Karma: -62
Senior Member
My measuring "sticks" are made of steel. Round bases which were drop outs
from some thick steel plate, about 5" in diameter, and vertical pieces
welded to their centers that are 3/4 x 3/4" square tubing. The rear ones
are cut to the length so they slide under the frame rails. They are stout
enough to support the coach at rear ride height.
The front ones are cut to the center of the slot, and stand beside the
frame.
At Rallies, we use a team and a person to record their findings.
Quick, simple. ACCURATE.
JIM HUPY
Salem, Oregon

On Thu, Jul 25, 2019, 4:44 AM Ken Henderson via Gmclist <
gmclist@list.gmcnet.org> wrote:

> My measuring sticks for beneath the frame are similar to Ken B's except
> that they're notched: I cut the stick to the distance from the ground to
> the proper height beneath the frame in the front. Then, I cut 1/2 the
> width down to the height at the rear. The 2" or so difference means
> there's no confusion about which area to use when. SInce I usually need
> them when setting ride heights, I want them to stand alone, so most are
> made from 4x4's. I don't haul them around.
>
> Using the measuring sticks for beneath the frame rather than to measure
> from the tops of the prescribed oval holes also has the advantage that they
> can be used at the left rear where the Onan obscures the hole.
>
> JWID,
>
> Ken H.
>
> On Thu, Jul 25, 2019 at 4:41 AM Ken Burton via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> When I bring my scales to a rally we usually weight 20 to 25 coaches. We
>> have done this at about 15 rallys (mostly GMCMI, Dixielanders, and
> Eastern
>> States). We have found about the same results. 2 or 3 out of the 20-25
>> are correct. Do not let this number bother you because people that have
>> their coaches setup correctly do not usually present them for weighing.
>>
>> On ride height, I have a set of blocks (measuring sticks) made out of
> 2x4s
>> and 1x2s cut the the correct length to slide under the frame in front and
>> rear. Also on the measuring sticks is a graduated scale so you can
> easily
>> read how low they are. It is very rare to see one high unless they have
>> crippled their air system with schrader and shut off valves, or the
>> wireless air system. Front ones are never high. The reason for two
>> different
>> size measuring sticks is so you can not mistake which ones are front vs.
>> rear. We take 4 guys each with a stick and as they pull in, measure
> their
>> heights. It takes longer to write the numbers down than it take to read
>> the sticks 30-35 seconds total for all 4. Then we pull ahead and weigh
>> them.
>>
>> I usually saw up a bunch of old 2x4s and 1x2s to the correct lengths and
>> hand them out at rallies to people that want them. I do not have the
>> length
>> numbers in front of me. They are written the measuring blocks that are
>> stored, along with my scales, at the airport. This method is sure a lot
>> easier than measuring down frame From the frame holes.
>> --
>> Ken Burton - N9KB
>> 76 Palm Beach
>> Hebron, Indiana
>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>
> _______________________________________________
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Re: [GMCnet] Ride height [message #345705 is a reply to message #345700] Thu, 25 July 2019 09:15 Go to previous messageGo to next message
Will Albers is currently offline  Will Albers   United States
Messages: 183
Registered: November 2017
Location: Detroit MI (Belleville)
Karma: 2
Senior Member
Block owners - Great idea! If you have a chance, would you mind doing a
quick measurement for us? Otherwise its easy enough to do with a ruler and
subtraction when im near my coach. I'm one of those wireless system owners.
Setting height quickly after we load up tackles one of the disadvantages to
the wireless system. Same could be said for when we leave the camp site.

On Thu, Jul 25, 2019 at 9:09 AM James Hupy via Gmclist <
gmclist@list.gmcnet.org> wrote:

> My measuring "sticks" are made of steel. Round bases which were drop outs
> from some thick steel plate, about 5" in diameter, and vertical pieces
> welded to their centers that are 3/4 x 3/4" square tubing. The rear ones
> are cut to the length so they slide under the frame rails. They are stout
> enough to support the coach at rear ride height.
> The front ones are cut to the center of the slot, and stand beside the
> frame.
> At Rallies, we use a team and a person to record their findings.
> Quick, simple. ACCURATE.
> JIM HUPY
> Salem, Oregon
>
> On Thu, Jul 25, 2019, 4:44 AM Ken Henderson via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> My measuring sticks for beneath the frame are similar to Ken B's except
>> that they're notched: I cut the stick to the distance from the ground to
>> the proper height beneath the frame in the front. Then, I cut 1/2 the
>> width down to the height at the rear. The 2" or so difference means
>> there's no confusion about which area to use when. SInce I usually need
>> them when setting ride heights, I want them to stand alone, so most are
>> made from 4x4's. I don't haul them around.
>>
>> Using the measuring sticks for beneath the frame rather than to measure
>> from the tops of the prescribed oval holes also has the advantage that
> they
>> can be used at the left rear where the Onan obscures the hole.
>>
>> JWID,
>>
>> Ken H.
>>
>> On Thu, Jul 25, 2019 at 4:41 AM Ken Burton via Gmclist > gmclist@list.gmcnet.org> wrote:
>>
>>> When I bring my scales to a rally we usually weight 20 to 25 coaches.
> We
>>> have done this at about 15 rallys (mostly GMCMI, Dixielanders, and
>> Eastern
>>> States). We have found about the same results. 2 or 3 out of the
> 20-25
>>> are correct. Do not let this number bother you because people that
> have
>>> their coaches setup correctly do not usually present them for weighing.
>>>
>>> On ride height, I have a set of blocks (measuring sticks) made out of
>> 2x4s
>>> and 1x2s cut the the correct length to slide under the frame in front
> and
>>> rear. Also on the measuring sticks is a graduated scale so you can
>> easily
>>> read how low they are. It is very rare to see one high unless they have
>>> crippled their air system with schrader and shut off valves, or the
>>> wireless air system. Front ones are never high. The reason for two
>>> different
>>> size measuring sticks is so you can not mistake which ones are front
> vs.
>>> rear. We take 4 guys each with a stick and as they pull in, measure
>> their
>>> heights. It takes longer to write the numbers down than it take to
> read
>>> the sticks 30-35 seconds total for all 4. Then we pull ahead and
> weigh
>>> them.
>>>
>>> I usually saw up a bunch of old 2x4s and 1x2s to the correct lengths
> and
>>> hand them out at rallies to people that want them. I do not have the
>>> length
>>> numbers in front of me. They are written the measuring blocks that are
>>> stored, along with my scales, at the airport. This method is sure a
> lot
>>> easier than measuring down frame From the frame holes.
>>> --
>>> Ken Burton - N9KB
>>> 76 Palm Beach
>>> Hebron, Indiana
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> Unsubscribe or Change List Options:
>>> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>>>
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
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>>
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1978 Palm Beach.
Detroit Michigan
Re: [GMCnet] Ride height [message #345714 is a reply to message #345705] Thu, 25 July 2019 14:18 Go to previous messageGo to next message
Rob is currently offline  Rob   United States
Messages: 651
Registered: November 2013
Location: Victoria, BC
Karma: 3
Senior Member
I was working on a Raspberry Pi based ultrasonic height measurement system to augment my Wireless Air (so that I'd be able to check ride heights from inside the coach) - but haven't had time to get back to it... I had it measuring fairly accurately - but couldn't find a good mounting location under the coach.

Maybe some day...

Rob
Victoria, BC
76 Royale - Rear Twins/Dry Bath

> On Jul 25, 2019, at 7:15 AM, Will via Gmclist wrote:
>
> Block owners - Great idea! If you have a chance, would you mind doing a
> quick measurement for us? Otherwise its easy enough to do with a ruler and
> subtraction when im near my coach. I'm one of those wireless system owners.
> Setting height quickly after we load up tackles one of the disadvantages to
> the wireless system. Same could be said for when we leave the camp site.
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Rob - Victoria, BC - 76 Royale - Rear Twins/Dry Bath
Re: [GMCnet] Ride height [message #345723 is a reply to message #345670] Thu, 25 July 2019 15:08 Go to previous messageGo to next message
Ken Henderson is currently offline  Ken Henderson   United States
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
Senior Member
Someone wanted to know the dimensions for measuring beneath the frame, so
I've posted a photo of the measuring block I carry to rallies with my
alignment jigs; the dimensions are marked on it:
http://www.gmcmhphotos.com/photos/ride-height-block/p66520-under-frame-ride-height-block.html


Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com


On Wed, Jul 24, 2019 at 12:57 PM Scott Nutter via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Front ride height to the top of the oval should be 13 1/8 inches +/- 1/4
> inch.
> Rear ride height to the top of the oval should be 11 11/16 inches +/- 1/4
> inch.
>
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
> drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrera
> installed MSD Atomic EFI
> Houston, Texas
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
Re: [GMCnet] Ride height [message #345731 is a reply to message #345723] Thu, 25 July 2019 16:06 Go to previous message
Ken Burton is currently offline  Ken Burton   United States
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
Senior Member
8-7/16" and 9-3/4". Thanks Ken. Now, I do not have to go look it it up.

The reason I made mine 4 separate sticks was so at the rallies we could have 4 people doing concurrent measurements before weighing. Also I always have scrap 2x4 cutoffs around. For someone at home the need for concurrent measurements probably would never come up and 2 of Colonel Ken's design might be better. You are less likely to loose one.

This is how we put the inch scale on them. Walmart has this in the paint section:
https://www.michaels.com/3m-scotch-expressions-masking-tape-ruler/10410914.html

One other comment. The reason for 2x4 size rear block is so the 2x4's the can also be used for sitting the rear frame on while adjusting front ride height. You only want to lock the rear frame height in place. So set the 2x4s vertical and drop the air until the frame just hits them and you are done. You only need to support maybe 50 - 100 pounds per side to keep it from moving while adjusting the front. The rest of the rear weight is still on the air suspension and tires.

Ken B.

Ken Henderson wrote on Thu, 25 July 2019 15:08
Someone wanted to know the dimensions for measuring beneath the frame, so
I've posted a photo of the measuring block I carry to rallies with my
alignment jigs; the dimensions are marked on it:
http://www.gmcmhphotos.com/photos/ride-height-block/p66520-under-frame-ride-height-block.html


Ken H.
Americus, GA
'76 X-Birchaven w/Cad500/Howell EFI & EBL,
Manny Brakes & 1-Ton, Troy-Bilt APU, etc., etc., etc.
www.gmcwipersetc.com


On Wed, Jul 24, 2019 at 12:57 PM Scott Nutter via Gmclist <
gmclist@list.gmcnet.org> wrote:

> Front ride height to the top of the oval should be 13 1/8 inches +/- 1/4
> inch.
> Rear ride height to the top of the oval should be 11 11/16 inches +/- 1/4
> inch.
>
> --
> Scott Nutter
> 1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final
> drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrera
> installed MSD Atomic EFI
> Houston, Texas
>
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Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana
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