| Looking for a KYB shock for some testing [message #287683] |
Mon, 21 September 2015 09:28  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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I have belstiens(sp) and I need to test my height sensor linkage with a KYB shock since they are longer.
does anyone in Minnesota have a good/bad/ugly one I can use?
It just need to move over the full range of travel.
Thanks
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: Looking for a KYB shock for some testing [message #287689 is a reply to message #287686] |
Mon, 21 September 2015 10:03  |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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I only need it for a few days.
Maybe I can convince Paul Dahlberg to let me take on off his yard ornament.
I doubt he'll get the engine issues figured out this fall
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: Looking for a KYB shock for some testing [message #287716 is a reply to message #287683] |
Mon, 21 September 2015 17:06 |
Gadabout
Messages: 124
Registered: March 2013
Location: Edmonton
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Hi Keith ,
Stock shocks control the rate of movement not the ride height.
If the shock you currently have installed is to short, to long or damaged it may be binding or bottoming out within the compression / rebound travel range.
You can test this by disconnecting one end of the shock and running the suspension though travel - raise - lower control settings
Hope this helps ....
Carl Harr : Driver NASCAR Pro Series #2
1978 Gadabout-Restoring
1978 Palm Beach
1976 Glenbrook
Prevost Featherlite H3-45
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| Re: Looking for a KYB shock for some testing [message #287961 is a reply to message #287716] |
Sun, 27 September 2015 23:23 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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Gadabout wrote on Mon, 21 September 2015 17:06Hi Keith ,
Stock shocks control the rate of movement not the ride height.
If the shock you currently have installed is to short, to long or damaged it may be binding or bottoming out within the compression / rebound travel range.
You can test this by disconnecting one end of the shock and running the suspension though travel - raise - lower control settings
Hope this helps ....
The shocks control the maximum travel of the suspension. without the shock the suspension is capable of a greater range of travel.
The Bilsteins don't have as much travel as the KYBs, thats probably one reason they get their ears pulled off.
I am designing a new height sensor, it needs to work with both types of shocks
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: Looking for a KYB shock for some testing [message #287962 is a reply to message #287961] |
Mon, 28 September 2015 00:58 |
Bullitthead
Messages: 1411
Registered: November 2013
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Just make your new height sensor cover the full range of the suspension travel and you're covered! Doesn't matter what shock absorber you install. Shocks are only used to dampen motion, not to limit the travel of the suspension in any way.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] Looking for a KYB shock for some testing [message #287970 is a reply to message #287969] |
Mon, 28 September 2015 10:04 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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James Hupy wrote on Mon, 28 September 2015 09:05Not on the GMC. They can and do limit suspension travel. Just put the
Caspro shocks on and find out for yourself. Same with bilstein.
Jim Hupy
Exactly, there are no bump stops on the rear of a GMC.
I'm sure thats why Bilsteins fail, they are quite a bit shorter than the KYBs
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] Looking for a KYB shock for some testing [message #287976 is a reply to message #287972] |
Mon, 28 September 2015 11:47 |
Bullitthead
Messages: 1411
Registered: November 2013
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If the shock is limiting the suspension travel in either direction during normal driving behavior, you have the wrong shock installed! That's why the shocks and mounts are getting broken...think about it. The only shocks that are DESIGNED to limit suspension travel in any way are STRUTS. Shocks holding the rear end from dropping off when a vehicle is on a lift or jacked up are in a non-operating condition, unless your normal driving behavior is like the Dukes of Hazzard.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] Looking for a KYB shock for some testing [message #287983 is a reply to message #287980] |
Mon, 28 September 2015 12:41 |
sgltrac
Messages: 2797
Registered: April 2011
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It the shocks are removed the bogey arms will drop all the way down until
they bind on the bogey box which is further than any shock ive seen is able
to reach. Unless of course the shocks are so long that they bottom prior to
bottoming of the air spring which would be bad.
Sully
77 Royale
77 Eleganza 2
seattle
On Mon, Sep 28, 2015 at 10:29 AM, Terry wrote:
> Well, my new shocks are not limiting the rear suspension travel, not
> acting as bump stops, and not stressing out the mounts, so I must have
> screwed up
> somehow... :)
> --
> Terry Kelpien
> ASE Master Technician
> 73 Glacier 260
> Smithfield, Va.
>
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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] Looking for a KYB shock for some testing [message #287984 is a reply to message #287980] |
Mon, 28 September 2015 12:58 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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Bullitthead wrote on Mon, 28 September 2015 12:29Well, my new shocks are not limiting the rear suspension travel, not acting as bump stops, and not stressing out the mounts, so I must have screwed up somehow... 
You are wrong.
Jack up the rear letting the suspension, hang, the pull the shocks ( if you can )
Make sure you are not underneath the bogie when it drops.
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] Looking for a KYB shock for some testing [message #287985 is a reply to message #287984] |
Mon, 28 September 2015 13:42 |
Bullitthead
Messages: 1411
Registered: November 2013
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Keith, having the suspension hanging is not normal driving behavior. How do you know that my shocks do not compress farther than the travel of the mounts when the suspension drops? You don't. So don't tell me I'm wrong. Read the posts and absorb the knowledge. If your shocks are acting as bump stops you will destroy the mounts and the shocks. That's all there is to it. If you make your height sensing device work over the entire range of the suspension, you've got it right. That's all there is to it.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: [GMCnet] Looking for a KYB shock for some testing [message #287986 is a reply to message #287985] |
Mon, 28 September 2015 14:29 |
Keith V
Messages: 2337
Registered: March 2008
Location: Mounds View,MN
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Bullitthead wrote on Mon, 28 September 2015 13:42Keith, having the suspension hanging is not normal driving behavior. How do you know that my shocks do not compress farther than the travel of the mounts when the suspension drops? You don't. So don't tell me I'm wrong. Read the posts and absorb the knowledge. If your shocks are acting as bump stops you will destroy the mounts and the shocks. That's all there is to it. If you make your height sensing device work over the entire range of the suspension, you've got it right. That's all there is to it.
Ha, I think I have more time analyzing the rear suspension than most people here, thank you very much.
No it's not normal driving behavior to have the suspension hang, I'm not designing for normal.
So tell us what magic shocks you are using, because you need shocks with about 2x the travel of the only 2 known available shocks, Bilstens / KYB, in order for the shock to not limit bogie travel.
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] Looking for a KYB shock for some testing [message #287987 is a reply to message #287986] |
Mon, 28 September 2015 14:39 |
Bullitthead
Messages: 1411
Registered: November 2013
Karma: 5
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Senior Member |
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Everybody is not getting the point! If your shocks are acting as bump stops you will destroy the mounts and the shocks. If the shock is stopping the suspension from moving during normal driving behavior, it or the mounts or both will be destroyed and that means the shock is the wrong size for the application. No ifs, ands, or bump stops. If anybody is jumping the GMC off sand dunes and railroad crossings or dragging the frame to impress the dingus boys on the street, then they will need to redesign the suspension or else they will destroy the shocks and the mounts. The fact that the shock may prevent the suspension from reaching it's last 1/4 inch of downward travel is meaningless unless you are installing them. That last 1/4 inch better not come into play during your normal driving behavior, because you will soon need a new vehicle if it does. The GMC is not a motocross bike or a Jeep or a Bronco.
I am aware of the reverse nature of the GMC rear shock installation, and the necessity of the shock to be LONG enough for the suspension to exercise nearly full travel in the UPWARD direction. This is the most important qualification when selecting shocks for the rear. If the shock stops the suspension from traveling upward over a speed bump enough times, you will break the shock or the mount or both. That's all there is to it!
I am using Monroe 555046 shock absorbers on the rear with no problems. I am the one who measured, selected based on those measurements, and installed them. It was only the 400th set of shocks I have installed in 45 years, so I guess I am just a newbie that doesn't have a clue. Everybody please ignore everything I post as it cannot possibly have any merit.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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