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Tech & Fab
90 XJ Radius Arm to 3 Link
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<blockquote data-quote="LightBnDr" data-source="post: 457735" data-attributes="member: 9031"><p>I have run radius arm as well as 3 link on your unit body setup. Unfortunately your wheel hop won't go away or get drastically better between the 2 setups. </p><p>If you are dead set on a 3 link I would have used the OEM upper link mount on the long side tube then gusseted it for strength. That way it doesn't interfere with track bar mounting. Looks like you are past that? Already cut the upper mount off?</p><p></p><p>It's a pickle for sure because I think you've already started cuttin it up. You can run the upper link mount to the inner C on the long side. You can build a small tight truss over the center section to duplicate the OEM mount or use that OEM mount. </p><p></p><p>If you are goin to go tons soon I would not put too much time and fab into this update. You will have to do it all over again on your new axles. </p><p></p><p>Plus 3 links don't track equally during suspension cycles between the right and left side. The axle tends to roll under the rig on one side drooped and away on the other side drooped. The further away you get from centering the upper link mount the worse this becomes. So not ideal for high speed racing. </p><p></p><p>On my 3 link I ran my upper link mount where your new bracket is in the picture. Then I mounted my track bar to the same link mount. </p><p></p><p>On my radius arm I ran upper links to my inner C's then connected them to the lower links just like you did. </p><p></p><p>The 3 link flexed to the moon but had serious cycling issues because of geometry. </p><p></p><p>Both setups made no change to axle hop. Has almost everything to do with the new spring rate used to lift it high enough for larger tires. Adjustable rancho 9k's seem to help a small amount but nothin like you want. </p><p></p><p>Hope this helps man. Post up with you final design. Pics <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="LightBnDr, post: 457735, member: 9031"] I have run radius arm as well as 3 link on your unit body setup. Unfortunately your wheel hop won't go away or get drastically better between the 2 setups. If you are dead set on a 3 link I would have used the OEM upper link mount on the long side tube then gusseted it for strength. That way it doesn't interfere with track bar mounting. Looks like you are past that? Already cut the upper mount off? It's a pickle for sure because I think you've already started cuttin it up. You can run the upper link mount to the inner C on the long side. You can build a small tight truss over the center section to duplicate the OEM mount or use that OEM mount. If you are goin to go tons soon I would not put too much time and fab into this update. You will have to do it all over again on your new axles. Plus 3 links don't track equally during suspension cycles between the right and left side. The axle tends to roll under the rig on one side drooped and away on the other side drooped. The further away you get from centering the upper link mount the worse this becomes. So not ideal for high speed racing. On my 3 link I ran my upper link mount where your new bracket is in the picture. Then I mounted my track bar to the same link mount. On my radius arm I ran upper links to my inner C's then connected them to the lower links just like you did. The 3 link flexed to the moon but had serious cycling issues because of geometry. Both setups made no change to axle hop. Has almost everything to do with the new spring rate used to lift it high enough for larger tires. Adjustable rancho 9k's seem to help a small amount but nothin like you want. Hope this helps man. Post up with you final design. Pics :) [/QUOTE]
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