3 link setup

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3 link setup

Postby theking380 » Mon Mar 20, 2017 8:54 am

Anyone have any advice, experience, tech articles, etc on setting up a 3 link front. I know there are calculators on the interwebs and each setup is different, just looking for general do's and dont's.
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Re: 3 link setup

Postby Pjizzle » Mon Mar 20, 2017 12:34 pm

The jeep forum on pirate has Topics of the month (TOTM) and TOTW (weekly) that they have put together as a discussion. Here is the one on 3 links. It has been a while since i looked through it so i dont know if it has anything good as far as design tips, but it will have examples of what people have done.

http://www.pirate4x4.com/forum/jeep-che ... sions.html
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Re: 3 link setup

Postby xj_man_646 » Tue Mar 21, 2017 7:03 am

As much as it can be, flat upper link (more separation at axle than at frame). If you want the pinion to rotate up as it droops out, longer upper link than the lower links (not a big issue with a HP front axle). Triangulation of the lower links isn't a big concern since you have a panhard bar, although I thought it was beneficial in the tart cart. Obviously try to match panhard and draglink in terms of angle and length, but angle is more important (mine were different in length by approximately 40% and I had no bumpsteer, but the angles were nearly flat). If you attach the upper and lower links to the same cross member, make the mounting provisions really strong.

The link calculator is out there and can help you visualize the pinion angle change with the suspension travel, your anti-dive numbers, etc.
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Re: 3 link setup

Postby larboc » Tue Mar 21, 2017 8:21 am

xj_man_646 wrote:As much as it can be, flat upper link (more separation at axle than at frame). If you want the pinion to rotate up as it droops out, longer upper link than the lower links (not a big issue with a HP front axle). Triangulation of the lower links isn't a big concern since you have a panhard bar, although I thought it was beneficial in the tart cart. Obviously try to match panhard and draglink in terms of angle and length, but angle is more important (mine were different in length by approximately 40% and I had no bumpsteer, but the angles were nearly flat). If you attach the upper and lower links to the same cross member, make the mounting provisions really strong.

The link calculator is out there and can help you visualize the pinion angle change with the suspension travel, your anti-dive numbers, etc.


You don't want any triangulation if you have a track bar. Links should be parallel.
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Re: 3 link setup

Postby xj_man_646 » Tue Mar 21, 2017 8:58 am

larboc wrote:
xj_man_646 wrote:As much as it can be, flat upper link (more separation at axle than at frame). If you want the pinion to rotate up as it droops out, longer upper link than the lower links (not a big issue with a HP front axle). Triangulation of the lower links isn't a big concern since you have a panhard bar, although I thought it was beneficial in the tart cart. Obviously try to match panhard and draglink in terms of angle and length, but angle is more important (mine were different in length by approximately 40% and I had no bumpsteer, but the angles were nearly flat). If you attach the upper and lower links to the same cross member, make the mounting provisions really strong.

The link calculator is out there and can help you visualize the pinion angle change with the suspension travel, your anti-dive numbers, etc.


You don't want any triangulation if you have a track bar. Links should be parallel.


Its worked for me and countless others out there. Perhaps you should give some facts related to the 'why' in your statement. The only thing that comes to mind is reaching the misalignment limit of the flex joints, but that wasn't an issue for me at all. Johnny joints on each end of the lower links, and heim joints on each end of the upper and panhard bar. Good to go. Besides, triangulating the lower links helps eliminate axle steer, which, if I am visualizing things correctly, could help reduce the amount of misalignment seen in the panhard bar joints.

Please, add more if I am mistaken in any way. Genuinely curious, because my front 3 link was just about perfect once I beefed up the crossmember and lowered the frame-side UCA mount. The only thing I wanted to change were the shocks, before I got rid of the rig. Your front suspension isn't a true 3 link, either, since the UCA attaches to the LCA rather than the frame...more of a single-sided radius arm setup.
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