Long Arms w/ rear Radius arms? - JeepForum.com

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post #1 of 23 Old 12-04-2006, 10:54 AM Thread Starter
YellowNJTJ02
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Long Arms w/ rear Radius arms?

Just curious as to why no one has built a kit with rear radius arms...

What would be the drawbacks of this?


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post #2 of 23 Old 12-04-2006, 11:08 AM
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Quote:
Originally Posted by YellowNJTJ02
Just curious as to why no one has built a kit with rear radius arms...

What would be the drawbacks of this?
I'm sure its all in the rear end geometry.. never really thought about it but I imagine it would behave really odd behavior under power.. probably have an insane amount of antisquat and the rear end would probably always want to drive under toward the front.


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post #3 of 23 Old 12-04-2006, 12:21 PM
Nikos
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what a radius arm is? is like a currie j-arms? I have seen a couple of rigs with them so far...

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post #4 of 23 Old 12-04-2006, 01:12 PM
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Quote:
Originally Posted by Nikos
what a radius arm is? is like a currie j-arms? I have seen a couple of rigs with them so far...
Radius arm replaces your upper control arm and connects from the lower control arm to the upper axle end mounting bracket. They are used alot on front end long arm kits.

like this:


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post #5 of 23 Old 12-04-2006, 01:33 PM
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Quote:
Originally Posted by geauxturbo
Radius arm replaces your upper control arm and connects from the lower control arm to the upper axle end mounting bracket. They are used alot on front end long arm kits.
thanks a lot

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post #6 of 23 Old 12-04-2006, 03:33 PM
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A while back I had was thinking of building a long arm. I thougth about using radius arms in the rear, but then I realized it probably wouldn't be good because of how it would be mounted. You would also have to put a track bar on the rear like in the front. 4 link is the best design out there. I think if it wasn't for clearance issues the front would be a true 4 link as well like most rear long arms.

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post #7 of 23 Old 12-04-2006, 03:51 PM
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Quote:
Originally Posted by JeepRocks86
...4 link is the best design out there...
Based on what? For what purpose? I assume you mean a triangulated 4 link? Nth uses a 4 link rear setup in their long arm design. Kindly explain what makes a triangulated 4 link (if that is what you meant) better than the Nth design.
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post #8 of 23 Old 12-04-2006, 04:15 PM
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That's what I meant, traiangulated. Isn't the Nth rear a triangulated 4 link? I honestly thing the best design for offroad is a double triangulated, it almost, if not fully, eliminates "flex steer" out of the rear if designed correctly. If done right it is very strong as well. the nth kit is one of the best out there.

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post #9 of 23 Old 12-04-2006, 05:03 PM
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Quote:
Originally Posted by JeepRocks86
Isn't the Nth rear a triangulated 4 link?

Nope, not even close.
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post #10 of 23 Old 12-04-2006, 08:25 PM
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I haven't looked at it, what is it then? It's out of my price range so I didnt' even want to look.

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'95 YJ fuel injected 302, 8.8, cage, ARBs.
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post #11 of 23 Old 12-04-2006, 08:41 PM
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Quote:
Originally Posted by JeepRocks86
I haven't looked at it, what is it then? It's out of my price range so I didnt' even want to look.

2 lower arms, the stinger replaces the uppers and then a track bar.


So technically.....a 4 link.
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post #12 of 23 Old 12-04-2006, 09:39 PM
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i remember, I forgot about their stinger.



It would have been a 4 link if it had another stinger. I like the triangulated because it helps eliminate the rear binding especially caused by the track bar, and hopefully the flex steer. I get a lot of that out of my SA kit. my rear axle has moved as much as 10" forward as a result to it.

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post #13 of 23 Old 12-04-2006, 10:21 PM
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Quote:
Originally Posted by JeepRocks86
It would have been a 4 link if it had another stinger.

No, it IS a 4 link. A "link" is defined as a point of connection. Your stock rear is a 5 link. 2 upper, 2 lowers, 1 trackbar.

THe Nth is a 4 link. 2 lowers, 1 stinger, 1 trackbar.
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post #14 of 23 Old 12-04-2006, 10:34 PM
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Quote:
Originally Posted by JeepRocks86
i remember, I forgot about their stinger.



It would have been a 4 link if it had another stinger. I like the triangulated because it helps eliminate the rear binding especially caused by the track bar, and hopefully the flex steer. I get a lot of that out of my SA kit. my rear axle has moved as much as 10" forward as a result to it.
Please define "flex steer". If you are talking about the tendency of the axle to steer in the direction of the high tire and away from the low tire, that is NOT caused by a track bar.

Please also tell me more about this "binding" caused by the track bar.
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post #15 of 23 Old 12-04-2006, 10:48 PM
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I know the track bar does not cause "flex streer" What happens when I wheel sometimes is that when I'm flexed on a rock for example the driver rear tire is down and the passenger is up the driver rear will have a tendency to move forward because of the control arm length or lack there of.

With the track bar it will sometimes bind in the rear from the pinion angles as well as from one side dropping at extreme angles. Personally I have a heim joint on the rear track bar to help eliminate this. This is often a problem with rubber bushings.

The track bar is not a bad thing, it's just prone to not allow the suspension to operate at its full potential.

I have had the rear axle move as much forward to cause the rear spring to pop out (rear shock broke off) and the driveshaft hit the muffler (has a dent). I have a picture of it some where with me holding the spring and the jeep flexed out.

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