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Home » Public Forums » GMCnet » [GMCnet] OEM / 1 Ton Front Suspension Comparison  () 1 Vote
[GMCnet] OEM / 1 Ton Front Suspension Comparison [message #332167] Wed, 16 May 2018 11:29 Go to previous message
USAussie is currently offline  USAussie   United States
Messages: 15912
Registered: July 2007
Location: Sydney, Australia
Karma:
Senior Member
G'day,

I decided to create a new thread with a Subject which can be easily found on the GMC net.

At the outset I would like to state that empirical engineering has demonstrated that the 1 ton suspension works. For those of you
who are not familiar with that term:

empirical em·pir·i·cal (em-per'i-k?l) adj. Relying on or derived from observation or experiment.

There are some differences which should be noted. If anyone disagrees with what I note below PLEASE call me to task!

1) GM never made a vehicle that used the 1 ton front wheel drive as the sole means of drive; the system was used in 4 wheel drive
vehicles.

2) The steering axis of the OEM and 1 ton is different; here's a link to a Y-Tube video that explains steering axis:

https://www.youtube.com/watch?v=IUcZ63unEyU

3) Here's a link to a GMC Drawing which shows the relationship of the steering axis inclination and tire contact patch:

http://www.gmcmhphotos.com/photos/aa-miscellaneous-photos/p56759-steering-axis.html

4) The 1 ton uses a spacer which as I understand it is 4 inches wide which moves the wheels outwards and puts the front wheels in
line with the rear wheels. It moves the contact patch of the tire outwards away from the steering axis.

http://machinesoflovinggrace.net/gmc/frontend/Images/Picture%20270-trim.jpg

5) The relationship of the upper and lower control arms are changed because the upper and lower ball joint tapers on the 1 ton are
further apart than the OEM knuckle. This has an effect on camber; at a GMCMI Convention Bob Drewes gave a presentation showing how
he changed the upper control arms to reduce the camber change.

http://www.gmcmhphotos.com/photos/g6613-bob-drewes-1-ton-installation.html

6) The location that the outer tie rod end connecting tapers are different:

http://machinesoflovinggrace.net/gmc/frontend/Images/Picture%20107-trim.jpg

Please note that I have not made ANY statements regarding the affects (or is it effects) of these differences.

Regards,
Rob M.
The Pedantic Mechanic
Sydney, Australia
AUS '75 Avion - The Blue Streak TZE365V100428
USA '75 Avion - Double Trouble TZE365V100426
USA '77 Kingsley - TZE 267V100808
 



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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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