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I just wanted to chime in a bit on your Y link style front longarms.

First, good call on the rubber bushing move to the johnny joint. I had the same issue in my XJ, the forces on them from the y link kinda kills em fast.

Second, be careful now that you solidified it up. By nature when you're flexing that out and one side droops while the other compresses, they're trying to twist the axle in opposing directions. I've seen people rip control arm mounts off the axle. Caster wants to twist forward in droop and backward in compression so when you're flexing out they're fighting eachother, its a pretty good bind with no more rubber bushings in the mix.

I used my XJ and now my WJ in rally racing and my solution in the XJ was to run only the driver side upper on the front with a krawler joint in the upper control arm axle mount. I ran it like this for a few years with good results.
 
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