4 link question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nickbwilson · 04-02-2013, 02:37 PM

i have a 85 short bed c10 that has bags on bars im running a 10" notch but the other day i was looking at it layed out and noticed the rear end pulls forward towards the front of the notch when i lay it out and goes back center when i lift it up im running a triangular 4 link any suggestions on how to get it from pulling like that

**lolife99** · 04-02-2013, 06:23 PM

Are the bars parallel to the ground at ride height?
Just the arc of the arms traveling upward will move them slightly forward.
The 4-link should keep your pinion angle the same throughout it's supsension cycle.

SCOTI · 04-02-2013, 08:49 PM

Quote:

Originally Posted by lolife99

Are the bars parallel to the ground at ride height?
Just the arc of the arms traveling upward will move them slightly forward.
The 4-link should keep your pinion angle the same throughout it's supsension cycle.

It should keep the pinion angle but the wheelbase still changes (since it's swing on an arc).

broey · 04-02-2013, 11:43 PM

the longer the bars the less noticeable it is.

wraprail · 04-03-2013, 01:04 AM

There are a lot of vairables when installing a triangulated four bar. Length of the bars, angle and hight all change what your pinion angle and wheelbase will do. With normal suspenion travel these changes can be kept to a minimum but when you get extreme (10+ inches) of travel you have to have computer designed parts and **** and aerospace dudes to make it work.
I just finished my own redneck garage, got me a wire feed, ebay directly from china, double throw down stainless steel triangleulated hum dinger of a four (4) link and I can tell you first hand, they don't come with instructions.
I'll wrap this up here real quick I promise..
Ok, I found that on my 4 link that I had to raise the front upper bar mounts on the frame and this took a lot of that axle moving forward crap.
But not all of it. I finally gave up and put in bump stops to limit the upward travel to where it started moving forward more thatr 3/4 inch or so.,
Remember, not only does it look lame, youir driveshafy yoke is moving into the transmission (unless you have a 2 piece)

I just started with my ride hight very low and buiilt from there. Don't go up a whole lot but so what. Goes down a ton so thats it..
Piece

04-02-2013, 02:37 PM	#1
nickbwilson Registered User Join Date: Apr 2008 Location: columbus indiana Posts: 86	4 link question i have a 85 short bed c10 that has bags on bars im running a 10" notch but the other day i was looking at it layed out and noticed the rear end pulls forward towards the front of the notch when i lay it out and goes back center when i lift it up im running a triangular 4 link any suggestions on how to get it from pulling like that

04-02-2013, 06:23 PM	#2
lolife99 67-72 parts collector,… Join Date: Nov 2002 Location: Mid-MO Posts: 22,682	Re: 4 link question Are the bars parallel to the ground at ride height? Just the arc of the arms traveling upward will move them slightly forward. The 4-link should keep your pinion angle the same throughout it's supsension cycle. __________________ Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823

04-02-2013, 11:43 PM	#4
broey Square Join Date: Feb 2011 Location: Phoenix Arizona Posts: 1,568	Re: 4 link question the longer the bars the less noticeable it is. __________________ Squarebody Syndicate

04-03-2013, 01:04 AM	#5
wraprail Registered User Join Date: Sep 2010 Location: Lake Havasu City Arizona Posts: 863	Re: 4 link question There are a lot of vairables when installing a triangulated four bar. Length of the bars, angle and hight all change what your pinion angle and wheelbase will do. With normal suspenion travel these changes can be kept to a minimum but when you get extreme (10+ inches) of travel you have to have computer designed parts and **** and aerospace dudes to make it work. I just finished my own redneck garage, got me a wire feed, ebay directly from china, double throw down stainless steel triangleulated hum dinger of a four (4) link and I can tell you first hand, they don't come with instructions. I'll wrap this up here real quick I promise.. Ok, I found that on my 4 link that I had to raise the front upper bar mounts on the frame and this took a lot of that axle moving forward crap. But not all of it. I finally gave up and put in bump stops to limit the upward travel to where it started moving forward more thatr 3/4 inch or so., Remember, not only does it look lame, youir driveshafy yoke is moving into the transmission (unless you have a 2 piece) I just started with my ride hight very low and buiilt from there. Don't go up a whole lot but so what. Goes down a ton so thats it.. Piece



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