Home » Public Forums » GMCnet » Urethane vs rubber suspension bushings (Urethane vs rubber suspension bushings)
| Urethane vs rubber suspension bushings [message #62967] |
Tue, 03 November 2009 17:58  |
gmchunter
Messages: 222
Registered: March 2008
Location: ORANGE, CA
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What are pros and cons of urethane vs rubber suspension bushings for our GMC's.
In my Porsche 356 urethane is much stiffer and therefore ride is stiffer and urethane has tendency to squeek. Has anyone noticed this with GMC's.
Michael
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| Re: Urethane vs rubber suspension bushings [message #62968 is a reply to message #62967] |
Tue, 03 November 2009 18:05  |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
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I also have been playing with Porsches for the past 35 years (and still do), and the bushing issues are still ongoing in those circles. I think the only reason to use derlin or other plastic bushings in a GMC would be that an original type rubber bushing is unavailable. The plastic bushings do give a better feel and tighter tolerances for suspension components (which may be of benefit in a racing Porsche), but would just transmit more ride harshness and noise to the GMC.
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] Urethane vs rubber suspension bushings [message #62972 is a reply to message #62968] |
Tue, 03 November 2009 18:20 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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George,
When I bought Double Trouble it had rubber bushing in the upper and lower
control arms. I drove it from Philly to Bangor to Niagara Falls to Orlando
with rubber bushings.
At the COOP I rebuilt the suspension and put in a set of Steve Ferguson's
reinforced lower control arms with Urethane bushings and offset rubber
bushings in the upper arms. I didn't notice additional road noise.
I have Khumo AT tires on my GMC which are supposedly noisier than HT tires.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of George Rudawsky
Sent: Wednesday, 4 November 2009 11:06 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Urethane vs rubber suspension bushings
I also have been playing with Porsches for the past 35 years (and still do),
and the bushing issues are still ongoing in those circles. I think the only
reason to use derlin or other plastic bushings in a GMC would be that an
original type rubber bushing is unavailable. The plastic bushings do give a
better feel and tighter tolerances for suspension components (which may be
of benefit in a racing Porsche), but would just transmit more ride harshness
and noise to the GMC.
--
George Rudawsky
Chicago, IL
75 Palm Beach
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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] Urethane vs rubber suspension bushings [message #62974 is a reply to message #62972] |
Tue, 03 November 2009 18:24 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
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Rob,
Could you comment on how the ride felt?
Thanks,
Larry Davick
The Mystery Machine
----- Original Message -----
From: "Rob Mueller" <robmueller@iinet.net.au>
To: gmclist@temp.gmcnet.org
Sent: Tuesday, November 3, 2009 4:20:10 PM GMT -08:00 US/Canada Pacific
Subject: Re: [GMCnet] Urethane vs rubber suspension bushings
George,
When I bought Double Trouble it had rubber bushing in the upper and lower
control arms. I drove it from Philly to Bangor to Niagara Falls to Orlando
with rubber bushings.
At the COOP I rebuilt the suspension and put in a set of Steve Ferguson's
reinforced lower control arms with Urethane bushings and offset rubber
bushings in the upper arms. I didn't notice additional road noise.
I have Khumo AT tires on my GMC which are supposedly noisier than HT tires.
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of George Rudawsky
Sent: Wednesday, 4 November 2009 11:06 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Urethane vs rubber suspension bushings
I also have been playing with Porsches for the past 35 years (and still do),
and the bushing issues are still ongoing in those circles. I think the only
reason to use derlin or other plastic bushings in a GMC would be that an
original type rubber bushing is unavailable. The plastic bushings do give a
better feel and tighter tolerances for suspension components (which may be
of benefit in a racing Porsche), but would just transmit more ride harshness
and noise to the GMC.
--
George Rudawsky
Chicago, IL
75 Palm Beach
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Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Urethane vs rubber suspension bushings [message #62975 is a reply to message #62967] |
Tue, 03 November 2009 18:30 |
Steven Ferguson
Messages: 3447
Registered: May 2006
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MIchael, George,
I have also switched autos over to all urethane suspension and dearly
regretted it. Pebbles caused fillings to drop out in a 70 Nova SS I
put together. I absolutely hated it.
Now put 5,000 lbs on those same bushings. All the squirm is gone,
none of the road irregularity transfer. I have well over a hundred
sets out there and the only feedback I have gotten is positive. I use
them myself and never, ever, feel the harshness you would feel in an
automobile.
Pros: It's the best replacement out there for the finishing touch on
a perfect suspension. No more squirm, better steering response and on
and on.
Cons: Having to carry around all that extra cash you've save from
being able to do the job yourself with no special tools, paying little
more for an entire set than a single lower costs. Having your wife
want to drive.
On Tue, Nov 3, 2009 at 4:58 PM, MICHAEL FOSTER <mfoster356@yahoo.com> wrote:
>
>
> What are pros and cons of urethane vs rubber suspension bushings for our GMC's.
>
> In my Porsche 356 urethane is much stiffer and therefore ride is stiffer and urethane has tendency to squeek. Has anyone noticed this with GMC's.
>
> Michael
> _______________________________________________
> GMCnet mailing list
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--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] Urethane vs rubber suspension bushings [message #62977 is a reply to message #62974] |
Tue, 03 November 2009 18:56 |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma: 6
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Larry,
I didn't notice any difference in the ride either.
I think we need to take into consideration the weight difference between a
GMC and a Toronado.
I'm not sure of the logic of what follows but:
The weight on the front end of a GMC is spec'd at max of 4,200 pounds in the
Operating Manual. That means each bushing is carrying a load of 1050 pounds.
According to the howstuffworks website the heaviest Toronado was 4838
pounds.
http://auto.howstuffworks.com/1971-1978-oldsmobile-toronado6.htm
Musclecar Club Website says the weight distribution was 54% front 46% rear.
http://www.musclecarclub.com/musclecars/oldsmobile-toronado/oldsmobile-toron
ado-history.shtml
Fifty four percent of 4838 is 2612 pounds dividing that by four you would
get a loading of 653 pounds on each bushing.
That means the bushings in the GMC would be carrying a load 65% more than
the car bushings.
Assuming that the bushings used in the GMC are the same as the ones used in
a car what does all this mean?
To me it means that Urethane bushings were a good idea! Did figure all this
out before I installed the bushings, nope, I'm not that smart!
Regards,
Rob Mueller
Sydney, Australia
AUS '75 Avion-The Blue Streak TZE365V100428
USA '75 Avion-Double Trouble TZE365V100426
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Larry Davick
Sent: Wednesday, 4 November 2009 11:25 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Urethane vs rubber suspension bushings
Rob,
Could you comment on how the ride felt?
Thanks,
Larry Davick
The Mystery Machine
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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: Urethane vs rubber suspension bushings [message #62982 is a reply to message #62967] |
Tue, 03 November 2009 19:14 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
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Steve,
Maybe the weight does make the difference. The Porsche groups have been going back and forth for years about the different materials to use for the bushings, and there are quite a few different opinions.
I've never driven a Urethane bushed GMC (or any other one than mine), so I'm glad to hear that they do not squeek or roughen the ride. They certainly do in a 2300 lb. Porsche, though you don't mind it when you're on a short, jaunty ride in the country. It gets a mite tiring after a while.
If the ride and squeeks don't occur in the GMC, there certainly is no doubt that they do a better job of keeping the suspension components in tighter tolerences.
I am glad that you folks are making aftermarket parts for these coaches, and hope that they continue improving these fine vehicles!
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: Urethane vs rubber suspension bushings [message #63063 is a reply to message #62967] |
Wed, 04 November 2009 07:46 |
fred v
Messages: 999
Registered: April 2006
Location: pensacola, fl.
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Steve, are your bushings offset for camber?
i was at an alignment shop for toe setting and the coach in front of me was having problems getting his set up right. the mechanic was talking about Urethane bushings solving the problem as they allow more accurate setting of the alignment and it stays there.
Fred V
'77 Royale RB 455
P'cola, Fl
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| Re: [GMCnet] Urethane vs rubber suspension bushings [message #63070 is a reply to message #63063] |
Wed, 04 November 2009 08:28 |
Steven Ferguson
Messages: 3447
Registered: May 2006
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Fred,
No one will make an offset urethane bushng for the upper a arms.
There would have to be a special sleeve made that would prevent them
from turning and no such sleeve exists. Since the upper a arms lead a
charmed life compared to the lowers, using OEM style rubber ones in
the forward position on the A arm and MOOG offsets in the rear
position should not present any reduced longevity problems. The
uppers outlast the lowers by almost double in the OEM installations.
Same for the upper balljoints. I no longer carry urethane uppers.
The extra caster gain by using an offset (only available in rubber)
bushing seems to be the way everyone wants to set up their GMCs.
The offset MOOG bushings were designed for additional Camber gains.
As some vehicles age, frame "sag" occurs allowing proper camber
adjustments to be made at the expense of additional negative caster.
Exactly opposite of what we want in our GMCs. By installing the
offset MOOG upper bushing exactly backwards of the included
instructions, you will realize additional caster gains. On good
frames some have gained as much as 3 deg of additional caster while
still maintaining zero camber.
Your mechanic was correct but with rubber bushings in good condition,
you should be able to properly align your front suspension.
I will say this again, if your coach has the original bushings in the
lower control arms, they are worn beyond service.
On Wed, Nov 4, 2009 at 6:46 AM, fred veenschoten <fredntoni@cox.net> wrote:
Steve, are your bushings offset for camber?
i was at an alignment shop for toe setting and the coach in front of
me was having problems getting his set up right. the mechanic was
talking about Urethane bushings solving the problem as they allow more
accurate setting of the alignment and it stays there.
--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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| Re: [GMCnet] Urethane vs rubber suspension bushings [message #63076 is a reply to message #63070] |
Wed, 04 November 2009 08:46 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
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My major GMC project for the month of September was to rebuild the front end. With Help and parts from Steve F and Dave L, I installed new ball joints, bushings (urethane on the lowers offset on the upper rears) and reconditioned knuckle/hub assemblies. I also had Jim K send me new "Energy Suspension" sway bar bushings and end links (also urethane). Upon finishing the project, I had the front end aligned and then proceded to drive the coach to the GMCMI rally in Pueblo. I did not notice any change in the ride other that the fact that it is now nice and tight. No squeaking or other noise either. That trip was about 1600 miles.
I also replaced all the bushings in the suspension on my '87 Jeep Cherokee a few years ago. Because of the unibody design, I stayed with rubber except for the bushings on the Rancho lower control arms. Again, not much of a noticable difference other than tightening everything up. The GMC Motorhome's body on frame design lends itsself well to urethane due to the isolation pads between the body and frame. As steve pointed out, the pros far outweigh the cons (none).
Carl Stouffer
'75 ex Palm Beach
Tucson, AZ.
Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member
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| Re: [GMCnet] Urethane vs rubber suspension bushings [message #63105 is a reply to message #62982] |
Wed, 04 November 2009 12:22 |
mwall
Messages: 7
Registered: March 2004
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Et al,
I was one of the first to run urethane and have it on my uppers and
lowers. No noise and less torsional twist on the arms when accelerating
but I don't have many miles on them either. Also, I spoke with the
bushing manufacturers when I was deciding on what to do and they were
clear that the current available rubber bushings were not designed for
the GMC's weight. Don't know about what the Jims are selling are but the
tech support people were pretty clear on that point. The Energy
Suspension people designed theirs for the GMC.
All of that said, their seem to be a lot of people running with new
rubber bushings without problems even with the extra GMC weight.
Just what I found out and did.
Mark Wall
76 E2
-----Original Message-----
From: gmclist-bounces@temp.gmcnet.org
[mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of George Rudawsky
Sent: Tuesday, November 03, 2009 7:14 PM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] Urethane vs rubber suspension bushings
Steve,
Maybe the weight does make the difference. The Porsche groups have been
going back and forth for years about the different materials to use for
the bushings, and there are quite a few different opinions.
I've never driven a Urethane bushed GMC (or any other one than mine), so
I'm glad to hear that they do not squeek or roughen the ride. They
certainly do in a 2300 lb. Porsche, though you don't mind it when you're
on a short, jaunty ride in the country. It gets a mite tiring after a
while.
If the ride and squeeks don't occur in the GMC, there certainly is no
doubt that they do a better job of keeping the suspension components in
tighter tolerences.
I am glad that you folks are making aftermarket parts for these coaches,
and hope that they continue improving these fine vehicles!
--
George Rudawsky
Chicago, IL
75 Palm Beach
_______________________________________________
GMCnet mailing list
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http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
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| [GMCnet] eldorado rear brake parts [message #63647 is a reply to message #63105] |
Mon, 09 November 2009 22:21 |
GMC_LES
Messages: 569
Registered: October 2009
Location: Montreal
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A long shot, but would anyone happen to have any 76-78 Eldorado rear disc
brake parts that they want to part with?
I need the rear caliper mounting plates and if possible the rear calipers.
Thanks,
Les Burt
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Les Burt
Montreal
1975 Eleganza 26ft
A work in Progress
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| Re: [GMCnet] Chuck Algur's Rear disc brake set-up [message #63766 is a reply to message #63685] |
Tue, 10 November 2009 20:53 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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We use the 80mm on the center and 70mm in the back. We also can use
the 65mm (76-78 Eldo) . They all use the same bolting pattern.
Reaction arm system has very little to do with sizes. It is all about
transferring the forces to where you end up with maximum traction at
the tire.
Once you have our system, you will be able to go to the reaction arm
system with minimal changes.
Should you have more questions on the systems, feel free to call me on
the 800 line .
On Tue, Nov 10, 2009 at 8:44 AM, Les Burt <burtco99@yahoo.com> wrote:
> What calipers are being used in Chuck's new equalizer brake system?
>
> Are they the smaller calipers(79+ GM) like the TSM system, or are they the
> large 76-78 Eldorado rear calipers?
>
> Thanks,
> Les Burt
>
> _______________________________________________
> GMCnet mailing list
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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] Chuck Algur's Rear disc brake set-up [message #63768 is a reply to message #63766] |
Tue, 10 November 2009 20:59 |
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ljdavick
Messages: 3548
Registered: March 2007
Location: Fremont, CA
Karma: -3
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Senior Member |
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Jim,
I don't want to put you on the spot, and maybe others can chime in,
but is it your feeling that with Chuck's reaction arm the size of the
rear disks is less important?
I suppose I should have first asked if size = $$.
Ljdavick at comcast.net
On Nov 10, 2009, at 6:53 PM, Jim Kanomata <jimkanomata@gmail.com> wrote:
> We use the 80mm on the center and 70mm in the back. We also can use
> the 65mm (76-78 Eldo) . They all use the same bolting pattern.
> Reaction arm system has very little to do with sizes. It is all about
> transferring the forces to where you end up with maximum traction at
> the tire.
> Once you have our system, you will be able to go to the reaction arm
> system with minimal changes.
> Should you have more questions on the systems, feel free to call me on
> the 800 line .
>
>
>
>
>
>
>
> On Tue, Nov 10, 2009 at 8:44 AM, Les Burt <burtco99@yahoo.com> wrote:
>> What calipers are being used in Chuck's new equalizer brake system?
>>
>> Are they the smaller calipers(79+ GM) like the TSM system, or are
>> they the
>> large 76-78 Eldorado rear calipers?
>>
>> Thanks,
>> Les Burt
>>
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
_______________________________________________
GMCnet mailing list
List Information and Subscription Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
Larry Davick
A Mystery Machine
1976(ish) Palm Beach
Fremont, Ca
Howell EFI + EBL + Electronic Dizzy
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| Re: [GMCnet] Chuck Algur's Rear disc brake set-up [message #63772 is a reply to message #63768] |
Tue, 10 November 2009 21:24 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
Karma: 9
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Senior Member |
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Since there will be considerably less skidding, we were able to use
80mm on all 4 rear wheels without the back 2 sliding.
We were running the front with 80mm caliper.
Oh, The disc/rotors we use are more than ample and will help allow
more cooling air and you need not worry about needing a special hub if
you need to replace them.
On Tue, Nov 10, 2009 at 6:59 PM, Larry Davick <ljdavick@comcast.net> wrote:
> Jim,
>
> I don't want to put you on the spot, and maybe others can chime in,
> but is it your feeling that with Chuck's reaction arm the size of the
> rear disks is less important?
>
> I suppose I should have first asked if size = $$.
>
> Ljdavick at comcast.net
>
> On Nov 10, 2009, at 6:53 PM, Jim Kanomata <jimkanomata@gmail.com> wrote:
>
>> We use the 80mm on the center and 70mm in the back. We also can use
>> the 65mm (76-78 Eldo) . They all use the same bolting pattern.
>> Reaction arm system has very little to do with sizes. It is all about
>> transferring the forces to where you end up with maximum traction at
>> the tire.
>> Once you have our system, you will be able to go to the reaction arm
>> system with minimal changes.
>> Should you have more questions on the systems, feel free to call me on
>> the 800 line .
>>
>>
>>
>>
>>
>>
>>
>> On Tue, Nov 10, 2009 at 8:44 AM, Les Burt <burtco99@yahoo.com> wrote:
>>> What calipers are being used in Chuck's new equalizer brake system?
>>>
>>> Are they the smaller calipers(79+ GM) like the TSM system, or are
>>> they the
>>> large 76-78 Eldorado rear calipers?
>>>
>>> Thanks,
>>> Les Burt
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> List Information and Subscription Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>
>>
>>
>>
>> --
>> Jim Kanomata
>> Applied/GMC, Fremont,CA
>> jimk@appliedairfilters.com
>> http://www.appliedgmc.com
>> 1-800-752-7502
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
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] Chuck Algur's Rear disc brake set-up [message #64006 is a reply to message #63766] |
Thu, 12 November 2009 10:11 |
Terry Skinner
Messages: 379
Registered: January 2004
Karma: 0
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Senior Member |
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I wonder why there are no pictures posted of this set-up?? Did I miss them??
On Tue, Nov 10, 2009 at 6:53 PM, Jim Kanomata <jimkanomata@gmail.com> wrote:
> We use the 80mm on the center and 70mm in the back. We also can use
> the 65mm (76-78 Eldo) . They all use the same bolting pattern.
> Reaction arm system has very little to do with sizes. It is all about
> transferring the forces to where you end up with maximum traction at
> the tire.
> Once you have our system, you will be able to go to the reaction arm
> system with minimal changes.
> Should you have more questions on the systems, feel free to call me on
> the 800 line .
>
>
>
>
>
>
>
> On Tue, Nov 10, 2009 at 8:44 AM, Les Burt <burtco99@yahoo.com> wrote:
>> What calipers are being used in Chuck's new equalizer brake system?
>>
>> Are they the smaller calipers(79+ GM) like the TSM system, or are they the
>> large 76-78 Eldorado rear calipers?
>>
>> Thanks,
>> Les Burt
>>
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> Jim Kanomata
> Applied/GMC, Fremont,CA
> jimk@appliedairfilters.com
> http://www.appliedgmc.com
> 1-800-752-7502
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Terry Skinner
Roy. Washington
'76 GMC
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| Re: [GMCnet] Chuck Algur's Rear disc brake set-up [message #64020 is a reply to message #64006] |
Thu, 12 November 2009 12:34 |
Carleton Douglas[1]
Messages: 174
Registered: March 2006
Karma: 0
|
Senior Member |
|
|
Terry, they were on Chucks and also on the western states website.
On Thu, Nov 12, 2009 at 9:11 AM, Terry Skinner <gmcnut@gmail.com> wrote:
> I wonder why there are no pictures posted of this set-up?? Did I miss them??
>
> On Tue, Nov 10, 2009 at 6:53 PM, Jim Kanomata <jimkanomata@gmail.com> wrote:
>> We use the 80mm on the center and 70mm in the back. We also can use
>> the 65mm (76-78 Eldo) . They all use the same bolting pattern.
>> Reaction arm system has very little to do with sizes. It is all about
>> transferring the forces to where you end up with maximum traction at
>> the tire.
>> Once you have our system, you will be able to go to the reaction arm
>> system with minimal changes.
>> Should you have more questions on the systems, feel free to call me on
>> the 800 line .
>>
>>
>>
>>
>>
>>
>>
>> On Tue, Nov 10, 2009 at 8:44 AM, Les Burt <burtco99@yahoo.com> wrote:
>>> What calipers are being used in Chuck's new equalizer brake system?
>>>
>>> Are they the smaller calipers(79+ GM) like the TSM system, or are they the
>>> large 76-78 Eldorado rear calipers?
>>>
>>> Thanks,
>>> Les Burt
>>>
>>> _______________________________________________
>>> GMCnet mailing list
>>> List Information and Subscription Options:
>>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>>
>>
>>
>>
>> --
>> Jim Kanomata
>> Applied/GMC, Fremont,CA
>> jimk@appliedairfilters.com
>> http://www.appliedgmc.com
>> 1-800-752-7502
>> _______________________________________________
>> GMCnet mailing list
>> List Information and Subscription Options:
>> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>>
>
>
>
> --
> Terry Skinner
> Roy. Washington
> '76 GMC
> _______________________________________________
> GMCnet mailing list
> List Information and Subscription Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist
>
--
Carleton Douglas
73 custom, by myself
Prescott, AZ
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