Home » Public Forums » GMCnet » [GMCnet] True Trac
| [GMCnet] True Trac [message #136509] |
Thu, 28 July 2011 22:27  |
SergeL
Messages: 169
Registered: January 2011
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Going through the receipts on my 1973, 26' GMC I found one that is for
installing a True Trac for $1050.00, can anyone tell me anything about this
and why it was needed? I am clueless about this item. Please keep it simple,
was this a good addition or?
thanks
Serge
1973 GMC
Deming, NM
He who expects no gratitude shall never be disapointed
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| Re: [GMCnet] True Trac [message #136518 is a reply to message #136509] |
Thu, 28 July 2011 23:01  |
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USAussie
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
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Serge,
Here's a link to Charles's pictures of the True Trac:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=32100
Unfortunately I am not sure of who Charles is, hopefully he will spot this
message and let us know.
Basically these devices keep the bogie arms in line.
I recently bought two pairs from Tom Hampton to install on the forward
facing bogies of Double Trouble and The Blue Streak. Tom noted that while he
would love to sell me four pairs they weren't really necessary on the rear
facing bogies.
Regards,
Rob M.
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 Serge Leduc
Sent: Friday, 29 July 2011 1:28 PM
To: gmclist@gmcnet.org
Subject: [GMCnet] True Trac
Going through the receipts on my 1973, 26' GMC I found one that is for
installing a True Trac for $1050.00, can anyone tell me anything about this
and why it was needed? I am clueless about this item. Please keep it simple,
was this a good addition or?
thanks
Serge
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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] True Trac [message #138023 is a reply to message #136509] |
Mon, 08 August 2011 11:40 |
GeorgeRud
Messages: 1380
Registered: February 2007
Location: Chicago, IL
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Do these work with the reaction arm system as well, or does that modification preclude their use?
Is the one on eBay the same as those JimK sells?
George Rudawsky
Chicago, IL
75 Palm Beach
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| Re: [GMCnet] True Trac [message #138026 is a reply to message #138023] |
Mon, 08 August 2011 11:52 |
Charles
Messages: 455
Registered: January 2004
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I don't think these will work with reaction arm but I'm not sure. I'm not sure they would even be needed with the reaction arm system. Ask Jim.
These are not the same as the one Jim sells but they are basically the same design. I think the one I show installed on Ebay is a picture of Jim's true track. I don't remember where I got that picture. They do serve the same purpose. Either his or mine will do the job.
Charles Wersal
Duncanville, Texas
26 foot 1975 Glenbrook
Pandora's Box
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| Re: [GMCnet] True Trac [message #138041 is a reply to message #138026] |
Mon, 08 August 2011 12:49 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
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No, AFAIK, there is not yet a True-Track design (TT) that will work with
the Reaction Arm (RA) system. Chuck Aulgur did re-install his TT (with
modifications) to the torque box which is the structural member of the RA
system on the inside of the suspension arm. But, Rick Flanagan, detail
designer of the RA system has some reservations about that -- he did not
allow for those loads in his design. At least one early installer of the RA
is working on another mounting method for the TT, but it will involve
machine work on the RA parts.
I REALLY wish TT had been a part of the basic RA design. I'm even reluctant
to install the RA I've committed to buy since it will cost me the TT.
Ken H.
On Mon, Aug 8, 2011 at 12:52 PM, Charles <gcw13@sbcglobal.net> wrote:
>
>
> I don't think these will work with reaction arm but I'm not sure. I'm not
> sure they would even be needed with the reaction arm system. Ask Jim....
>
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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] True Trac [message #138043 is a reply to message #138041] |
Mon, 08 August 2011 13:02 |
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WD0AFQ
Messages: 7111
Registered: November 2004
Location: Dexter, Mo.
Karma: 207
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| Ken Henderson wrote on Mon, 08 August 2011 12:49 |
No, AFAIK, there is not yet a True-Track design (TT) that will work with
the Reaction Arm (RA) system. Chuck Aulgur did re-install his TT (with
modifications) to the torque box which is the structural member of the RA
system on the inside of the suspension arm. But, Rick Flanagan, detail
designer of the RA system has some reservations about that -- he did not
allow for those loads in his design. At least one early installer of the RA
is working on another mounting method for the TT, but it will involve
machine work on the RA parts.
I REALLY wish TT had been a part of the basic RA design. I'm even reluctant
to install the RA I've committed to buy since it will cost me the TT.
Ken H.
On Mon, Aug 8, 2011 at 12:52 PM, Charles <gcw13@sbcglobal.net> wrote:
>
>
> I don't think these will work with reaction arm but I'm not sure. I'm not
> sure they would even be needed with the reaction arm system. Ask Jim....
>
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Ken, I was also reluctant but did it. Not much difference in handling. Now, Gary Kosier has modified his so the tracks work, I believe.
Dan
3 In Stainless Exhaust Headers
One Ton All Discs/Reaction Arm
355 FD/Quad Bag/Alum Radiator Manny Tran/New eng.
Holley EFI/10 Tire Air Monitoring System
Solarized Coach/Upgraded Windows
Satelite TV/On Demand Hot Water/3Way Refer
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| Re: [GMCnet] True Trac [message #138048 is a reply to message #138026] |
Mon, 08 August 2011 13:26 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
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| Charles wrote on Mon, 08 August 2011 09:52 |
I don't think these will work with reaction arm but I'm not sure. I'm not sure they would even be needed with the reaction arm system. Ask Jim.
These are not the same as the one Jim sells but they are basically the same design. I think the one I show installed on Ebay is a picture of Jim's true track. I don't remember where I got that picture. They do serve the same purpose. Either his or mine will do the job.
|
I'm with Charles on this. I know the RA system is not designed to act in the same way as the true track system, but I think it may have the same effect, at least to some extent, as an unintended design benefit. Look at this picture and see if you don't agree:
http://www.gmcmhphotos.com/photos/showphoto.php?photo=40037&title=sway-bar-2ftorque-box-connection&cat=5831
The sway bar is secured to the frame with bushings and collars, so it cannot slide back and fourth laterally, and it is connected to the torque box with very little slack on the pivot tube. This can be tightened up further by adding one more washer next to the o-ring. I'm sure the bars will have a small ammount of flex in them, but they are plenty stiff.
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] True Trac [message #138116 is a reply to message #138048] |
Mon, 08 August 2011 21:41 |
Kosier
Messages: 834
Registered: February 2008
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----- Original Message -----
From: "Carl Stouffer" <carljr3b@yahoo.com>
To: <gmclist@temp.gmcnet.org>
Sent: Monday, August 08, 2011 2:26 PM
Subject: Re: [GMCnet] True Trac
>
>
> Charles wrote on Mon, 08 August 2011 09:52
>> I don't think these will work with reaction arm but I'm not
>> sure. I'm not sure they would even be needed with the reaction
>> arm system. Ask Jim.
>> These are not the same as the one Jim sells but they are
>> basically the same design. I think the one I show installed on
>> Ebay is a picture of Jim's true track. I don't remember where
>> I got that picture. They do serve the same purpose. Either his
>> or mine will do the job.
>
>
> I'm with Charles on this. I know the RA system is not designed
> to act in the same way as the true track system, but I think it
> may have the same effect, at least to some extent, as an
> unintended design benefit. Look at this picture and see if you
> don't agree:
>
> http://www.gmcmhphotos.com/photos/showphoto.php?photo=40037&title=sway-bar-2ftorque-box-connection&cat=5831
>
> The sway bar is secured to the frame with bushings and collars,
> so it cannot slide back and fourth laterally, and it is
> connected to the torque box with very little slack on the pivot
> tube. This can be tightened up further by adding one more
> washer next to the o-ring. I'm sure the bars will have a small
> ammount of flex in them, but they are plenty stiff.
> --
> Carl S.
> '75 ex Palm Beach
> Tucson, AZ.
Carl,
You need one more washer on the inside on that wheel.
Gary Kosier
77EII & 77PB
Newark, Ohio
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| Re: [GMCnet] True Trac [message #138123 is a reply to message #138116] |
Mon, 08 August 2011 23:00 |
Carl S.
Messages: 4186
Registered: January 2009
Location: Tucson, AZ.
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| Kosier wrote on Mon, 08 August 2011 19:41 |
Carl,
You need one more washer on the inside on that wheel.
Gary Kosier
77EII & 77PB
Newark, Ohio
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Thanks Gary, I was thinking that same thing. It seems like I need to add one washer to each of those. They were supplied in the kit, but not shown on the instructions (referred to as kind of an option). I will remedy that situation.
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] True Trac [message #138131 is a reply to message #138123] |
Tue, 09 August 2011 00:52 |
jimk
Messages: 6734
Registered: July 2006
Location: Belmont, CA
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The curved units seem to be more effective, but back in the 80's some
of the people realized that the unit was to assist most when
traveling down the road and not so much going over rough terrain.
You'll find that we use a straight channel with deep pocket that has
been working well for several years.
On Mon, Aug 8, 2011 at 9:00 PM, Carl Stouffer <carljr3b@yahoo.com> wrote:
>
>
> Kosier wrote on Mon, 08 August 2011 19:41
>> Carl,
>>
>> You need one more washer on the inside on that wheel.
>>
>> Gary Kosier
>> 77EII & 77PB
>> Newark, Ohio
>>
>> _______________________________________________
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>
>
> Thanks Gary, I was thinking that same thing. It seems like I need to add one washer to each of those. They were supplied in the kit, but not shown on the instructions (referred to as kind of an option). I will remedy that situation.
> --
> Carl S.
> '75 ex Palm Beach
> Tucson, AZ.
> _______________________________________________
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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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www.appliedgmc.com
1-800-752-7502
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| Re: [GMCnet] True Trac [message #169093 is a reply to message #169088] |
Wed, 09 May 2012 20:25 |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
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| ljdavick wrote on Wed, 09 May 2012 17:44 |
Does anyone know if the Straight Trac system Jim K sells is meant to work with the reaction arm system? ...
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From what I have read posted here on the GMCnet:
NO. The straight track or true track's will not work with the reaction arm system. While it should be possible to "make" them work together, From what I understand, it isn't needed.
The latest variation (the production version) of the reaction arm uses sway bars for the reaction arm. As a side effect, the sway bars provide some stabilization to the leading boogie reducing the need for "true track" like system.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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