There are several spots that limit articulation, first is the frame mount for the radius arm, when the axle drops too far the large washer at the frame mount hits the mount,I cut the frame mount off and rewelded it back to the frame perpindicular to the radius arm. Next on extreme travel the bottom shock mount binds in the mount, I made some shock joints that bolt between the bottom shock bushing and its mount so there is no binding and shock can move all over freely. Next the trac rod is hard to flex,on the frame end I put a flex joint, had to modify frame mount. At the c bushings I took a grinder and ground edges thinner but left the locating ridge alone feathering from the ridge out to the edge. This loosens them up but still allows them to stay located. And need longer shock to take advantage of extra drop.And I like rubber bushings at radius arm frame mount.And you need soft coil springs that allow flex.I run extended radius arms.
