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rebelBullDawg325 07-19-2007 09:15 PM

suspension questions
i always see talk about 3 link suspension and stuff of that nature..... but what exactly is a 3-link suspension? is there a 4 link? i guess i really just want a suspension system break down. starting with coil springs, then coil overs, and on up from there. (i understand leaf springs SUA and SOA). thanks in advanced. i'm sure i'm not the only newb who wonders this stuff so some1 try and write up a real nice article or somethin and maybe it'll get put on as a sticky

1BLKJP 07-20-2007 10:49 PM

Well for the most part you need to factor in the trac bar on any coil sprung/coil overed suspension (at least in the front). The only way to really get rid of the trac bar is to triangulate the front end and go to full hydro steering (like Mr. Clifford has).

When someone is talking about a front 3 link (like RockKrawler) they are talking about 3 front control arms. 2 lowers and 1 upper. Technically when you consider the trac bar it's a 4 link or at the least a 3 link with trac bar. Now a stock TJ has a 5 link or 4 link with trac bar with 2 uppers and 2 lowers.

Rear suspensions are a tad easier because you don't have all of the steering issues that you do up front. The stock rear suspension is also a 5 link or 4 link with trac bar. Most suspension companies make a long arm kit or upgrade that triangulates the rear suspension allowing you to remove the rear trac bar since the triangulation of the upper control arms will keep the axle centered under the vehicle. However even with a triangulated rear you are still utlizing 4 control arms 2 upper triangulated mounted to 1 point (Cradle) and 2 lowers. Some refer to this as a triangulated 3 link.

Hackle 07-21-2007 04:54 PM

RBD, You are familiar with leaf springs and how they work so I will explain this from that point.
With leaf springs as they are attached to the frame at two points and the axle at one. Locate the axle without anything else required.

With a coil or coilover set up they can not locate the axle so you need upper and lower control arms to locate the axle as it moves up and down add in a track bar/panhard bar to locate the axle left to right and you have a working suspension.

You can angle the control arms using trianglulation and it will also control the left to right movement. The rear is easyier then the front, it gets harder due to the engine and exhaust getting in the way.

One big gain on the linked set up is no more axle wrap!

I hope this helps some there is a lot of info available on the internet on all of this and I spent about 3 months searching before I built my rear 4 link.

1BLKJP 07-22-2007 02:43 AM


Originally Posted by Hackle (Post 107218)
One big gain on the linked set up is no more axle wrap!

Yeah, unless you were using Toys by Troys link setup. :D :mad:

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