[sykikchimp]

This is not a problem with spherical bearings.

The problem with the poly bushings is that poly doesn't have the ability to flex around an axis like rubber or spherical bearings would. SO, wwhen the LCA moves through it's arc, the bushing resist's the motion up and down b/c it is clamped, and held in place b/w the mounting points. Thus causing the T/C rod mount to bind on the LCA, and eventually rip free. Unless the poly bushing can rotate on the metal insert it will cause this problem, no matter who makes it.

I've read that drilling the holes in it like a revolver allows the bushing to flex much better, and makes them safer, but if the mount is still clamping on the edges of the bushing, you'll still get binding. I would think drilling them would also lessen their effectiveness of maintaining suspension geometry under load, but probably not enough to matter.

Something else to help prevent this is to make sure you really lube up the metal insert before you put it inside the bushings. Like lots, and lots of grease. Poly has to be able to move freely.

Either way you go there are pro's and cons.

This is the reason Nismo uses hard rubber bushings instead of poly. Rubber allows axial twist.

edit- just thought I would add that poly LCA bushings further exacerbate this problem.