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03-25-2008, 09:10 PM
Alright, I'm trying to design a 3 link for the front of the ZJ.
I've done enough reading for my brain to hurt and my eyes to bleed. I know I can do this but it's a lot to take it (or I'm going about this the wrong way.
Basically I want to mount the links inboard of the frame (don't want them hanging below the frame rail if I can avoid it. I'm using the 3 Link Calculator (http://www.pirate4x4.com/forum/showthread.php?t=204893) and I'm just lost.
I'm looking for some help from someone who knows more then I.
Also, what are the disadvantages/advantages to running flex joints at both end of the link?
03-25-2008, 09:47 PM
http://rockmodified.com/fab/ppe/index.htm go there then step by step and photo gallery that is mine 3 link front.
03-25-2008, 10:06 PM
Very nice Nick.
How's it drive on the road? Ever had it to freeway speeds?
I'm gonna be looking at those pictures a lot.
03-25-2008, 10:09 PM
drives very nice had it to about 75 with that setup. The rear still is not done so it still is a little rough with the short arms. I have wheeled it like that also all around a ton of work but performs and rides very nice.
03-25-2008, 10:16 PM
Awesome, good to hear it'll work on the street.
Any pics of how the upper mounts to the axle?
Any wheeling or flex pics?
03-25-2008, 10:26 PM
I dont have any pics on this comp of the upper mount on the axle
03-26-2008, 08:49 AM
What kinda #'s are you getting out of it?
03-26-2008, 10:20 AM
Like RTI numbers?Originally Posted by minydigger
03-26-2008, 10:47 AM
I think he might be asking for anit-dive numbers? I would be curious to know what you are running as well, if you did use a calculator.
03-26-2008, 11:38 AM
I dont know what any of the numbers are because we never calculated them or used any calculators when designing it.
03-26-2008, 12:17 PM
3-link in the front? Be careful with how you do it, this just happened Monday to one of my club members from his home-designed 3-link (upper-link being a wishbone)
http://thexota.org/d/9420-1/Dsc04395.jpg
http://thexota.org/d/9427-1/Dsc04397.jpg
Hard to say what failed since it threw him into a guard rail and rolled it - ripped apart the control arms.
03-26-2008, 12:37 PM
I'm guessing the wishbone was replacing both upper CAs and the track bar?
I could see that beaing fairly scary, but if you run a three link with a panhard (but wouldn't that really be a four link somewhow?)...
Just seems like there would be a TON of forces at work on a wishbone, where a three link with panhard the forces should be fairly linear in each of the links...
03-26-2008, 12:44 PM
Correct, no trackbar.
03-26-2008, 12:56 PM
That does come into my mind when I drive the jeep. But I have faith in it I acualy hit a black bear going about 50 on the way down to RC with the new suspension. Everything stayed solid the only thing was the factory lower control arm axle mount bent wich I have replaced since then. So after that insident I do have more confidence in the build. But it does sit in the back of my mind knowing that if one thing on that upper arm fails it wont be to good.
03-26-2008, 01:44 PM
Running 1 upper and having it fail SUCKS.
Yeah, it was my bad on the design but DAMN. Quite the incident =P
03-26-2008, 07:21 PM
I will be running a track bar.
I crawled under the truck today with a piece of pipe, a tape measure and my camera. Looks like to get the arms in line with the stock brackets the lowers will have to be run on a bit of an angle or I will have to just move the axle mounts in a bit. Any issues to moving the mounts inward or mounting the arms at an angle?
Upper will have to go on the driver side as it's IMPOSSIBLE to do it on the passenger side due to the down pipe/y-pipe.
If anyone cares, I'll post the pictures later.
03-26-2008, 08:18 PM
3 Link lower, bad picture but it was only me under there holding the camera and trying to hold up the pipe. I'll get more pictures tomorrow.
Just for fun and because I know one or two people want to see this. My idea for the rear 4 link.
In regards to said rear 4 link, Lowers will be inboard of the frame, same as the uppers. I think a cross member tying the mounts to each other and the frame will be good.
Last edited by ILikeMud; 03-26-2008 at 08:38 PM.
03-27-2008, 10:27 PM
I pretty much did the same thing just set it up so everything fit like I wanted
still have to button up some things like skid plates and such, don't mind the steering it is being replaced
03-27-2008, 10:41 PM
Good b/c the angles you have there are pretty scary!
03-28-2008, 01:41 AM
Why would you run the lowers that close together left to right? You loose oposing triamgulation to the uppers. Run them on the bottom of the frame rails. Make your axle mount width wider than the frame side. Your AS and AD dive numbers must suck with the upper and lowers that close together. How does it climb hills?
03-28-2008, 06:20 PM
What about mounting the mounts on the OUTSIDE of the frame rail?
03-28-2008, 07:23 PM
Why not just put them on the bottom?
03-28-2008, 09:31 PM
Because I don't want them hanging below the frame.
03-30-2008, 03:03 PM
Why? They make skid plates. Design a nice ramped mount and run them on the bottom of the rail. You need more vertical seperation between upper and lowers than what on the inboard or outboard side mounted lowers can provide. Unless you don't have issue poking the upper mount into the passenger conpartment.
03-30-2008, 03:24 PM
I think you are going in the wrong way in trying to make the lowers that high, you need the vertical seperation and the uppers have no place to go unless you are ripping out the rear floor to put them higher. You also do not want the lowers mounted higher than the transfer output either and you would certainly be crowding it.
This kind of bracket allows for a smooth transition from frame to link and mounting them on the unirail with a ~10 degree axle mount helps with triangulation.
The other question I would ask is how are you going to miss the Unirail with the link under compression as it goes back to the axle? If you go straight back you could but you would be doing nothing to eliminate the panhard requirement.
And yes, this is my first post here but I do have a smigen of an idea of how it's done.....
Last edited by Dan Fredrickson; 03-30-2008 at 03:29 PM.
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