Home » Public Forums » GMCnet » [GMCnet] Ride Height
| [GMCnet] Ride Height [message #39729] |
Tue, 07 April 2009 14:28  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Someone with new side rails, with no ride height reference notches, just
asked me to measure the distances from those notches to the bottom of the
side rails. I hopes someone will save the information where I can find it,
here it is:
The front reference notches are in the front clip, just forward of the joint
with the side rails. It makes more sense to measure the distance from the
top of the notch to the bottom of the side rail behind the joint: That
distance is 3-1/4” So the specified ride height dimension should place the
bottom of the side rail at 9-7/8” +- ¼” from the floor (disregarding tire
size, pressure, wear, etc.).
The rear reference notches are specified as 40-3/8” aft of the mid-point
between the center and rear wheels on a 23’ coach or 56-3/8” on a 26’ coach.
I found the distance from the rear-most edge of the side rail, where it
joins the rear clip, to that notch to be 10-1/4”; I suspect it’s the same on
the 26’, but someone should verify that. The distance from the top of the
reference notch to the bottom of the side rail is 3-1/4” there also. So a
block under the side rail at about 10” forward of the rear clip joint should
be 8-7/16” +- ¼” to establish the correct ride height (disregarding tire
size, pressure, wear, etc.).
Personally, I’d prefer to adjust the rear ride height to have the Zerks at
the same height as the spindles. Then measure the floor-to-bottom-of-frame
height just behind the rear wheels. Add 1-7/16” (1-1/2” is easier) and use
that as the target for the front ride height at the bottom of the forward
ends of the side rails. That compensates for the differences in tire sizes,
thickness of new side rails, etc.
Ken Henderson
Americus, GA
GMCWipersEtc.com
’76 X-Birchaven
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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] Ride Height [message #39737 is a reply to message #39729] |
Tue, 07 April 2009 15:40  |
Bill Massey
Messages: 201
Registered: March 2009
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Will this do, Ken?
http://www.gmcmhphotos.com/photos/showphoto.php?photo=10463
and
http://www.bdub.net/gmc-faq.html Listed under SUSPENSION.
bdub
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org [mailto:gmclist-bounces@temp.gmcnet.org]
On Behalf Of Ken Henderson
Sent: Tuesday, April 07, 2009 2:29 PM
To: gmclist@temp.gmcnet.org
Subject: [GMCnet] Ride Height
Someone with new side rails, with no ride height reference notches, just asked
me to measure the distances from those notches to the bottom of the side rails.
I hopes someone will save the information where I can find it, here it is:
The front reference notches are in the front clip, just forward of the joint
with the side rails. It makes more sense to measure the distance from the top
of the notch to the bottom of the side rail behind the joint: That distance is
3-1/4” So the specified ride height dimension should place the bottom of the
side rail at 9-7/8” +- ¼” from the floor (disregarding tire size, pressure,
wear, etc.).
The rear reference notches are specified as 40-3/8” aft of the mid-point between
the center and rear wheels on a 23’ coach or 56-3/8” on a 26’ coach.
I found the distance from the rear-most edge of the side rail, where it joins
the rear clip, to that notch to be 10-1/4”; I suspect it’s the same on the 26’,
but someone should verify that. The distance from the top of the reference
notch to the bottom of the side rail is 3-1/4” there also. So a block under the
side rail at about 10” forward of the rear clip joint should be 8-7/16” +- ¼” to
establish the correct ride height (disregarding tire size, pressure, wear,
etc.).
Personally, I’d prefer to adjust the rear ride height to have the Zerks at the
same height as the spindles. Then measure the floor-to-bottom-of-frame height
just behind the rear wheels. Add 1-7/16” (1-1/2” is easier) and use that as the
target for the front ride height at the bottom of the forward ends of the side
rails. That compensates for the differences in tire sizes, thickness of new
side rails, etc.
Ken Henderson
Americus, GA
GMCWipersEtc.com
’76 X-Birchaven
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| Re: [GMCnet] Ride Height [message #39777 is a reply to message #39729] |
Tue, 07 April 2009 21:49 |
rwbmitiopt@comcast.net
Messages: 189
Registered: April 2005
Karma: 0
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Ken
Wasn't me that asked for ride height but I was hooking up my towed today and thought the stern looked high. I will cut a couple of dowels and check tomorrow. I may be in the market for those fancy adjustable rods. Know where I could get a set? LOL
Thanks for the info.
Randy
| Ken Henderson wrote on Tue, 07 April 2009 12:28 |
Someone with new side rails, with no ride height reference notches, just
asked me to measure the distances from those notches to the bottom of the
side rails. I hopes someone will save the information where I can find it,
here it is:
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Randall Burns
Sammamish WA
75 EX GB
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| Re: [GMCnet] Ride Height [message #39783 is a reply to message #39781] |
Tue, 07 April 2009 22:06 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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We use a wood stick that are cut to the height since the generator
blocks the hole in the back and can stand up on its own.
We made some up for several people and passed out dimensions couple
years ago.KEN BURTON asked us for one over a year ago.
On Tue, Apr 7, 2009 at 7:56 PM, Ken Henderson <ken0henderson@gmail.com> wrote:
> Would you believe -- naaah, not a chance anyone would believe I haven't
> thought about having those for sale since Dothan. :-)
>
> Ken Henderson
> Americus, GA
> GMCWipersEtc.com
> '76 X-Birchaven
>
> -----Original Message-----
> Ken
> Â Wasn't me that asked for ride height but I was hooking up my towed today
> and thought the stern looked high. I will cut a couple of dowels and check
> tomorrow. I may be in the market for those fancy adjustable rods. Know where
> I could get a set? LOL
> Â Thanks for the info.
> Â Randy
>
> _______________________________________________
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Ride Height [message #39893 is a reply to message #39890] |
Wed, 08 April 2009 22:53 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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I'm too embarrrest to give you my measurements.
I will just say your correct.
On Wed, Apr 8, 2009 at 8:40 PM, Ken Henderson <ken0henderson@gmail.com> wrote:
> Jim,
>
> Are you gonna verify my dimensions (F 9-7/8" & R 8-7/16") (and save yourself
> some postage), or keep us wondering how long your Ornamental dowels are? :-)
>
> Ken H.
>
> -----Original Message-----
> Dan,
> You need to ask!!! Â We have plenty of wood and saw blades in the table saws.
> I'll tell Donny to cut you a set and I'll send them to your house.
>
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] Ride Height [message #39909 is a reply to message #39869] |
Thu, 09 April 2009 07:39 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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Senior Member |
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That's what I did for my ride height adjusting.....I cut a maple block 1 1/2 x 1 1/2 x the length to the bottom of the frame. One for the front, one for the back, makes setting the ride height very easy.
Ray
Ray & Lisa Erspamer
78 Royale Center Kitchen
The Malosco Cruiser (TZE368V101144)
Wauwatosa, Wisconsin 53226
Email: 78GMC-Royale@att.net
414-745-3188
Web Site: http://ray-lisa.page.tl/
----- Original Message ----
From: Jim Kanomata <jimkanomata@gmail.com>
To: gmclist@temp.gmcnet.org
Sent: Wednesday, April 8, 2009 7:38:23 PM
Subject: Re: [GMCnet] Ride Height
Dan,
You need to ask!!! We have plenty of wood and saw blades in the table saws.
I'll tell Donny to cut you a set and I'll send them to your house.
On Tue, Apr 7, 2009 at 8:25 PM, Dan Gregg <gregg_dan@hotmail.com> wrote:
>
>
> Jim, Why didn't Donny give me one of those when he and Alonzo checked mine?
> :) Dan
> --
> Dan & Teri Gregg
>
>
> http://www.danandteri.blogspot.com
>
>
>
>
>
> Halon Automatic Fire Extinguishers
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--
Jim Kanomata
Applied/GMC, Fremont,CA
jimk@appliedairfilters.com
http://www.appliedgmc.com
1-800-752-7502
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Ride Height [message #69060 is a reply to message #39729] |
Thu, 31 December 2009 08:44 |
George Zhookoff
Messages: 398
Registered: December 2004
Location: Snellville, GA
Karma: 6
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Senior Member |
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Ken,
Thanks. I have a modified OTC tool I just bought from a lister.
I was just a little surprised at how low the coach is.
Ordered tie rod ends and idler arm from JimK. When they get here and weather clears & warms I'll get on it.
Any decisions on the PB? Let me know if I can help.
George
78 EL II
Snelllville, GA
----- Original Message -----
From: gmclist-bounces@temp.gmcnet.org <gmclist-bounces@temp.gmcnet.org>
To: gmclist <gmclist@temp.gmcnet.org>
Sent: Wed Dec 30 23:17:01 2009
Subject: Re: [GMCnet] Ride Height
George,
IIRC, 6 turns -->1" in ride height. If correct you should have plenty of
threads left. If not, you can buy longer grade 8 bolts, round the end to
fit the socket, and gain a little more adjustment. Do you need to borrow my
torsion bar tool? Ooops! -- it's in Chicago. But if you need it, I'll try
to get it back. Better yet, I think Dixielanders own one; John Richardson
is the keeper.
Ken H.
On Wed, Dec 30, 2009 at 10:54 PM, George Zhookoff <gzhookoff@e2m.com> wrote:
> Well replaced control arms with steve F rebuilt arms. Checked ride height
> before going for an alignment. FL down 2" FR down almost 3". Porkchop
> adjustment bolts look like 2" more adjustment left. My question: Is this
> enough to pickup the front the required additional height?
> Thanks,
> George Zhookoff
> 78 EL II
> _______________________________________________
>
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| Re: [GMCnet] Ride height [message #306795 is a reply to message #39729] |
Fri, 09 September 2016 09:24 |
Tom Whitton
Messages: 235
Registered: February 2004
Location: Paducah, KY
Karma: 0
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Senior Member |
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Ken,
The stepped block of wood to fit under the frame, front and back, is a good idea. I'm going to make one today. Thanks for the tip.
Tom Whitton
26 foot updated GMC
Paducah, KY
Message: 1
Date: Wed, 7 Sep 2016 23:47:46 -0400
From: Ken Henderson
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Ride height
Message-ID:
Content-Type: text/plain; charset=UTF-8
As someone mentioned, I use a length of 4x4 as a ride height gauge.
Overall, the block 9-3/4" high. One half of the block is cut down to
8-7/16" high. The high part is labelled "Front", the lower, "Rear". Those
are the heights of the bottom of the frame directly below the front and
rear measurement ovals when the ride height is correct. (Fact is, I thing
the 8-7/16" is 1/16" in error).
But what I really want to get across is that, despite its importance to
proper handling, we need to realize just what the effect of ride height is
on caster change. Remember that the wheelbase of a 26' GMC is 160". From
simple trigonometry, a 1" change in front vs rear ride height will yield
only 0.358* of caster change (arctan (1/160)). So, to achieve 1* more
caster, we'd have to ride around with the rear airbags almost all the way
down (it rides hard there). :-)
Ken H.
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| Re: [GMCnet] Ride height [message #345718 is a reply to message #39729] |
Thu, 25 July 2019 14:33 |
Dolph Santorine
Messages: 1236
Registered: April 2011
Location: Wheeling, WV
Karma: -41
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Rob
What an incredibly cool project.
Dolph Santorine
DE AD0LF
Wheeling, West Virginia
1977 ex-Palm Beach TZE167V100820
Howell EFI/EBL , Reaction Arms, Manny Transmission
> On Jul 25, 2019, at 3:18 PM, Rob via Gmclist wrote:
>
> 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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| Re: [GMCnet] Ride height [message #345725 is a reply to message #345718] |
Thu, 25 July 2019 15:25 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
Karma: 0
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Rob,
How accurate is fairly accurate?
________________________________
From: Gmclist on behalf of Adolph Santorine via Gmclist
Sent: Thursday, July 25, 2019 2:33 PM
To: Rob via Gmclist
Cc: Adolph Santorine
Subject: Re: [GMCnet] Ride height
Rob
What an incredibly cool project.
Dolph Santorine
DE AD0LF
Wheeling, West Virginia
1977 ex-Palm Beach TZE167V100820
Howell EFI/EBL , Reaction Arms, Manny Transmission
> On Jul 25, 2019, at 3:18 PM, Rob via Gmclist wrote:
>
> 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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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com
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| Re: [GMCnet] Ride height [message #345745 is a reply to message #345725] |
Thu, 25 July 2019 21:14 |
Rob
Messages: 651
Registered: November 2013
Location: Victoria, BC
Karma: 3
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Senior Member |
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Keith:
The sensor I was testing with (JSN-SR04T) is rated for 2 mm (!) accuracy - but I think it's realistically closer to 5 or 10 mm.
The issue I had was the "minimum" distance that this waterproof sensor could read - it's about 20 cm (~8 inches). My initial search for a place to mount on the GMC wasn't successful and I didn't get back to the project - the breadboard is still sitting in my family room...
Rob
Victoria, BC
76 Royale - Rear Twins/Dry Bath
> On Jul 25, 2019, at 1:25 PM, Keith V via Gmclist wrote:
>
> Rob,
> How accurate is fairly accurate?
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Rob -
Victoria, BC -
76 Royale - Rear Twins/Dry Bath
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