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Unread 02-19-2012, 05:23 PM   #1
cherokeemudman0
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suspension guys please help wont flex

i am in the process of installing a rustys 8.5 lift. they havent be able to give me any help on phone and im out of ideas.so far i have put in my lca brackets and made crossemeber for the long arm setup. both of the lower arms are at same angle and upper arms are at same angle. i have cut the uca mounts off the long are since my truss made the angles of upper arms wrong (hiem was almost maxed out) and set the so that the heim joint is now straight. i tried to flex the truck wiithout coils in it on jackstands. i can lift the passenger side up to 11 deq angle and then driverside starts coming up. i can lift driverside up to a 7 deg angle and passenger side starts lifting. it seems really tight and bound up but there is no pressure on the bolts or any force of any kind i had to use to assembly it. if i remove the uca's the axle will flex as much as i can jack it up with no prob but as soon as the uca are in its stiff. i thought this radious setup would flex like crazy but its all bound up and im at a loss. here are some pics if anyonr can help with ideas i would really appricate it.

6664.jpg   6665.jpg   6667.jpg   6668.jpg   6669.jpg  

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Unread 02-19-2012, 05:33 PM   #2
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That's standard radius arm for you. Just visualize what's going on when you articulate and it should click....RA's rely on bind so it's inevitable that you'll have plenty of it in the system. It'll go further when you've actually got the weight of the Jeep pushing down on it but the bushings won't be happy. Do your research next time.
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Unread 02-19-2012, 06:01 PM   #3
cherokeemudman0
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i did alot of research before i did it. i see lots of xj with a RA setup getting tons of flex. this is my first attempt at this so pointing it right dirrection would help. i thought putting the heim joints in instead of the flex joints would help also. what would be better a 3 link setup?
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Unread 02-19-2012, 06:09 PM   #4
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3 link it for more flex.
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Unread 02-21-2012, 03:50 PM   #5
cherokeemudman0
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narrowed the prob down to being something with the trac bar. without it axle is free and flexs but when its on its stiff. anyone input on how to fix this prob?
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Unread 02-21-2012, 04:53 PM   #6
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You're at 8" of lift man. Most of the droop in your TRE's and track bar are already taken up at ride height. Droop isn't gonna be something in your repertoire without some rework or some lowering.
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Unread 02-21-2012, 08:45 PM   #7
ftgiles
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You've got plenty of triangulation doing what triangulation does... Bind!

Too much separation at the axle and way too much angle on the track bar.
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Unread 03-09-2012, 12:40 AM   #8
collin9749
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If you are not running a nice over the knuckle steering your articulation will be very limited
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Unread 03-09-2012, 12:45 PM   #9
Jaric00n
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Ok...noob remark here....but shouldn't the lower control arms and upper control arms be independent?
in pic #1 it looks like your upper control arms are attached to the lower control arms....that might be a problem?
looking at a bunch of pics on google and none of them show the UCA attached to the LCAs

just an observation....
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Unread 03-09-2012, 01:43 PM   #10
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Quote:
Originally Posted by Jaric00n View Post
Ok...noob remark here....but shouldn't the lower control arms and upper control arms be independent?
in pic #1 it looks like your upper control arms are attached to the lower control arms....that might be a problem?
looking at a bunch of pics on google and none of them show the UCA attached to the LCAs

just an observation....
It is a common practice to have Y links for long arms.

Clayton Long arms:
http://eastcoastgearsupply.com/i-497...g-arm-kit.html
TNT customs long arms:
http://www.tntcustoms.com/Rock-Tek/4...erokee_XJ.aspx
Iron Rock Offroad long arms:
http://www.ironrockoffroad.com/Merch...egory_Code=PFX
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Unread 03-09-2012, 01:54 PM   #11
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interesting....
Thank for the info foggybottombob!
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Unread 03-13-2012, 05:28 PM   #12
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Take one of the two upper links out, that is how my suspension is setup. When you articulate the upper arm that is drooping is pulling on the axle tube, the one compressing is pushing the axle tube. I've seen people like this that have spun the axle tubes right out of the pumpkin when trying to flex too much. Since you are straight axle you can pull one upper link, I say the side away from the driveshaft. Here is mine:





I only have an upper link on the passenger side, I thought I had a pic of the driver's side but I guess not. No upper link on that side.
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Unread 03-16-2012, 01:55 PM   #13
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the simple fix is to remove the passenger side upper arm, that will reduce some of the inherrent bind in the Radius arm system.

IF you do that you need to replace the existing upper arm bolts with at least 9/16"" bolts, the stock size bolts are not strong enough to only rely on one. you should also probably change the upper mount for a 2.5" joint, instead of a 2".
I would reccomend wedling an insert into the upper arm, putting a 2.5" johnny joint in it, and welding 2 tabs onto your truss to capture it.

you are also going to run into some serious difficulties with the trackbar being that high. it will severely limit your droop, the best thing you can do is build a new trackbar that uses rod ends instead of TREs, raise the axle end, lower the frame end a bit, and then build yourself a steering system to match the angle of the new TB.
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Unread 03-17-2012, 08:54 PM   #14
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Quote:
Originally Posted by ftgiles View Post
You've got plenty of triangulation doing what triangulation does... Bind!
thats a bit simplistic. a triangulated system can be very compliant. what he has is a radius system and this is how they work.

Quote:
Originally Posted by ftgiles View Post
Too much separation at the axle
without measuring it looks similar to most link systems.

Quote:
Originally Posted by ftgiles View Post
and way too much angle on the track bar.
the pic is obviously showing full droop.
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Unread 03-18-2012, 11:39 AM   #15
addicted2dunes
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thats a bit simplistic. a triangulated system can be very compliant. what he has is a radius system and this is how they work.


without measuring it looks similar to most link systems.



the pic is obviously showing full droop.
Out of that whole post what was your help to the original post?
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