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Unread 08-22-2009, 07:55 PM   #1
ghudson434
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will a y link radius arm work

I have a 93 grand and planning on building a "y" link radius arm setup for the front. I was wondering if this same set up would work for the rear. I am a newbie and have searched and cant find this topic for a zj but have seen it on a tj i believe. I have a 2 in budget boost but im planning on a fr to rear swap before i do this build.

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Unread 08-22-2009, 08:19 PM   #2
sandman
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your best bet for the rear is to triangulate the upper arms and eliminate the track bar. hop over on mallcrawlin and brouse through their members rigs section most of those guys have custom LA set ups.
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Unread 08-22-2009, 08:30 PM   #3
ghudson434
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read some about that and that seems a little complex. but i will check that out. seen alot of figureing out geometry stuff but ill read up some more on it.
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Unread 08-22-2009, 09:22 PM   #4
FortCollinsZJ
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A double triangulated or single triangulated four link is much easier to make it work, there is just som many builds to get ideas from.

That being said, if you do a radious arm setup in the rear, you will have a trackbar, unless you triangulate the radious arms, which is a possibility. I would suggest a double triangulated setup if you can do it.
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Unread 08-22-2009, 09:53 PM   #5
ghudson434
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where would i need to start in designing the triangulated 4 link and would i also need to design the y link for the front or is it as easy as it looks? i mean as far as just makeing the cross member and the control arm brackets and the control arms? or is it certain angle that the arms need to be in relation to say flat ground that i need to know to build these? maybe im wrong but yes they both look simple but i see the chart with axle squat and stuff like that and its kinda confuseing me. im not really looking for huge amounts of articulation just looking to make the ride more comfortable when i go higher with the lift.
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Unread 08-22-2009, 09:54 PM   #6
StrokedWJ
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Radius arms do not work well in the rear. Your anti-squat #'s will be horrendous.
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Unread 08-22-2009, 09:59 PM   #7
ghudson434
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Quote:
Originally Posted by YHC2000WJ View Post
Radius arms do not work well in the rear. Your anti-squat #'s will be horrendous.
what do i need to know before i start building this thing? i know how to read and am willing to do it. just let me know what to read or point me in a direction for someone just learning.
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Unread 08-23-2009, 08:36 AM   #8
StrokedWJ
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Google 4-link rear suspension. Theres a **** ton of reading out there to do. I think 4wd magazine had a recent article that touched on the basics of rear suspension design.

Go to Pirate4x4.com and Mallcrawlin.com and do some more research & reading. Then, once you understand the basic principles, get under your rig with a tape measure and a 4-link calculator and start laying out a design. You'll most likely have to make some trade offs between the best setup in the calculator and what actually fits on your jeep.
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Unread 08-23-2009, 11:44 AM   #9
FortCollinsZJ
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Ok some quick rules of thumb.

Upper arms, should be 70% of the length of the lower arms, give or take.

Mount the uppers on the axle above the differential, and the lowers flush with the tube. The seperation between the links at the body end should be half the measurment of the axle end, IE lower link to upper link on the axle end could be 10", the body should be close to 5" seperation height wise, if that makes sense.

It is best to mount the ends of the lowers as wide as possible on the axle, it creats stability and flexes better, just watch out for tire clearance. The angle of the tabs on the upper axle truss ideally is 22.5 degrees, same for the body side lower tabs if making a double triangulated 4 link.
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Unread 08-23-2009, 05:35 PM   #10
ghudson434
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well im more lost than i was before i started reading guess i should just buy a kit from somewhere that has all the angles and lengths already figured out. way over my head. thanks guys.
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Unread 08-23-2009, 07:53 PM   #11
FortCollinsZJ
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NO! I say build not buy! If you have the ability to read, and a welder, or access to one, you can save yourself a ton of money. I am building my entire rear suspension for under 350.00! probably less!

Just read and read some more, about a week of research for an hour or two a night, and you should have enough info to at least start a build.
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Unread 08-23-2009, 08:01 PM   #12
FortCollinsZJ
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Ok, this link is to a tracker build, but litterally the same principal, granted this guy is wicked good at fabbing, but I just really like how he shows so many detailed pics.

Kelsey's DD tracker - Page 2 - MallCrawlin.com Forums

Here is a good picture to show you a double triangulated rear four link.
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