Home » Public Forums » GMCnet » Alignment Question
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| Re: [GMCnet] Alignment Question [message #88017 is a reply to message #88005] |
Thu, 10 June 2010 22:39   |
Jim Bounds
Messages: 842
Registered: January 2004
Karma: 0
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Senior Member |
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Hey Scott--- "Flying Brick" a good one! I think in your situation I think I would put offset bushings only on the back position. I think the Revcons I messed with would react @ the same on specifications. The first big filter in sortingan alignment is seeing how far the caster usually on the pass. front wheel. If I could dial in each side to what I wanted, things would be much better. I can usually get 3 deg. with standard bushings but then there's that 1! We did that on Arch's coach way back
Jim Bounds
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----- Original Message ----
From: Scott Brown <sbrown928@comcast.net>
To: gmclist@temp.gmcnet.org
Sent: Thu, June 10, 2010 10:46:13 PM
Subject: [GMCnet] Alignment Question
Greetings,
So, I have to replace most of the rubber components on the front end of my Revcon, yea, the GMC's big brother. :p I am planning of replacing the lower control arm bushings with the urethane version but I just don't know if I will need the upper bushings to have that extra offset adjustability.
I tried to do some reading on your alignment specs but it's tough to get a good idea if your specs would work on my Revcon. Yea, I know, it's very different but I'm hoping the collective knowledge here can help.
If it turns out that the increased offset bushings aren't necessary, would you recommend going all urethane?
Some Revcon specs that may help. Total weight: 7100 lbs as it sits now.
25.5' feet in total, wheelbase - 185".
Any advice you can dish out is appreciated.
Scott
The Flying Brick
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| Re: [GMCnet] Alignment Question [message #88041 is a reply to message #88014] |
Fri, 11 June 2010 08:35 |
Sandra Price
Messages: 709
Registered: May 2006
Karma: 1
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Senior Member |
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Scott, my personal experience with urethane bushings on the front end has
been negative.
I put them on my '67 El Camino when I did a ground-up restoration and it
made the truck ride rough. I would not recommend urethane bushings other
than for sway bar mounts or links.
Bob Price
On Thu, Jun 10, 2010 at 10:23 PM, Scott Brown <sbrown928@comcast.net> wrote:
>
>
> Found some additional information for you to digest. From a service
> technical bulletin from the factory. I give you the alignment specs.
>
> Ride Height: 10" + 1/16"
> Camber:
> LH: +1/2* +1/4*
> 0*
> RH: 0* + 0*
> -1/4*
>
> Left hand camber to be 1/2* more positive than right hand
>
> Caster: Set caster at 0* + 1/2* on left and right hand sides
>
> Toe: Set toe at 1/8" + 1/16" toe out.
>
> Don't know if that helps. It's all kinda Greek to me.
>
> Scott
> _______________________________________________
> GMCnet mailing list
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>
--
IN GOD WE TRUST!
Sandra and Bob in the 51st Year of our State of Marriage
“Life’s a Trip” in “The Roadhouse”
’73 Painted Desert
Huntsville, TX
Finally, all of you, live in harmony with one another, be sympathetic, love
as brothers, be compassionate and humble. Do not repay evil with evil or
insult with insult, but with blessing, because to this you were called so
that you may inherit a blessing. --1 Peter 3:8-9
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| Re: [GMCnet] Alignment Question [message #88095 is a reply to message #88041] |
Fri, 11 June 2010 16:29 |
Steven Ferguson
Messages: 3447
Registered: May 2006
Karma: 0
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Senior Member |
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Prices,
I installed urethane bushings on a Nova SS I restored and absolutely
hated the brittle ride that resulted. There is so much weight on the
front end of a GMC, just about the only difference in ride quality you
can feel is with the zero deflection when you stop, go, or turn. The
urethane bushings are the last word when getting the slop out of your
steering. By last word, I am saying that after you replace everything
else, it is the coup de grasssy for that last little bit of slop and
wander. The are not a bandaid for other problems.
On Fri, Jun 11, 2010 at 6:35 AM, Sandra Price <bsprice9359@gmail.com> wrote:
> Scott, my personal experience with urethane bushings on the front end has
> been negative.
>
> I put them on my '67 El Camino when I did a ground-up restoration and it
> made the truck ride rough. I would not recommend urethane bushings other
> than for sway bar mounts or links.
>
> Bob Price
> On Thu, Jun 10, 2010 at 10:23 PM, Scott Brown <sbrown928@comcast.net> wrote:
>
>>
>>
>> Found some additional information for you to digest. From a service
>> technical bulletin from the factory. I give you the alignment specs.
>>
>> Ride Height: 10" + 1/16"
>> Camber:
>> LH: +1/2* +1/4*
>> 0*
>> RH: 0* + 0*
>> -1/4*
>>
>> Left hand camber to be 1/2* more positive than right hand
>>
>> Caster: Set caster at 0* + 1/2* on left and right hand sides
>>
>> Toe: Set toe at 1/8" + 1/16" toe out.
>>
>> Don't know if that helps. It's all kinda Greek to me.
>>
>> Scott
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> IN GOD WE TRUST!
>
> Sandra and Bob in the 51st Year of our State of Marriage
> “Life’s a Trip” in “The Roadhouse”
> ’73 Painted Desert
> Huntsville, TX
>
> Finally, all of you, live in harmony with one another, be sympathetic, love
> as brothers, be compassionate and humble. Do not repay evil with evil or
> insult with insult, but with blessing, because to this you were called so
> that you may inherit a blessing. --1 Peter 3:8-9
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: Alignment Question [message #88105 is a reply to message #88005] |
Fri, 11 June 2010 17:51 |
rowing guy
Messages: 31
Registered: October 2009
Location: Outside Philly
Karma: 0
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Member |
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Thanks Folks,
I appreciate the help.
Jim, if I order the offset bushings, it comes with both uppers, do I have to buy 2 sets of bushings or is there a way to get one offset bushing (per side) and one regular bushing for the upper front?
I also spoke to Steve Ferguson about the urethane bushings, I have a concern that my lower control arms, and uppers for that matter, could be different then the GMCs. I took a look under the coach and can't see much of a difference but it's pretty hard to tell. Anyone know what I should be looking for?
Since I have no choice but to replace the control arm bushings, I thought I'd go with the urethane as I do have more slop than I would like. I will also be replacing some other things as well. Idler arm, sway links and bushings as well as new bilsteins.
Scott
The Fling Brick
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| Re: [GMCnet] Alignment Question [message #88133 is a reply to message #88105] |
Fri, 11 June 2010 20:15 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Senior Member |
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Scott,
I'm not trying to be a smart ass and would like to help you as demonstrated
by the fact that I posted the GMC alignment specs for you.
However, you're asking a group of people that own GMC motorhomes to tell you
if the control arms in your Revcon are different from the GMC.
I for one have never seen a Revcon "in the flesh." Let alone crawled under
it to examine the control arms to see if they're different from the ones on
my GMC.
If I were you I'd do a search on the GMC Photo site for "front suspension"
or "control arms;" print the pictures out and then take a front wheel off
your Revcon and compare them.
http://www.gmcmhphotos.com/photos/
In fact if you remove one of your wheels, take some pictures of your control
arms and post them to the GMC Photo Site I'd be happy to look at them and
give you my opinion if they're the same or not.
Even then how would you know if the bushings are the same.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: Scott Brown
Thanks Folks,
I appreciate the help.
Jim, if I order the offset bushings, it comes with both uppers, do I have to
buy 2 sets of bushings or is there a way to get one offset bushing (per
side) and one regular bushing for the upper front?
I also spoke to Steve Ferguson about the urethane bushings, I have a concern
that my lower control arms, and uppers for that matter, could be different
then the GMCs. I took a look under the coach and can't see much of a
difference but it's pretty hard to tell. Anyone know what I should be
looking for?
Since I have no choice but to replace the control arm bushings, I thought
I'd go with the urethane as I do have more slop than I would like. I will
also be replacing some other things as well. Idler arm, sway links and
bushings as well as new bilsteins.
Scott
The Fling Brick
_______________________________________________
GMCnet mailing list
List Information and Subscription 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
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I am planning of replacing the lower control arm bushings with the urethane version but I just don't know if I will need the upper bushings to have that extra offset adjustability.
