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.
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.
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.
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.
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.
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.