Originally Posted by addicted2dunes
Are you kidding me?
1. Johnny joints do not transfer much NVH at all, anyone who thinks so has never used a johnny joint. those poly bushings you posted will transfer more NVH to the vehicle than a johnny joint.
2. you posted links to Poly bushings, I would only use those on the uppers in a radius arm, since they do not need to travel much. never on the lowers or the panhard.
Also, why would you waste the money on the axle side of a radius arm with rod ends? There's no flex there, you're basically solid mounted to the axle. Use bushings.
there is plenty of "flex" required in the axle side lower mounts, the uppers could be bushings, but not the lowers.
What you're saying is not true without any parameters. Can you put a Johnny Joint or Rod End everywhere? Nope, not in both ends of an arm if the arm has a bend in it like a Radius Arm or this OP's track bar. Bent arms will fall over if not supported by either a rubber or poly bushing.
the OP's current arms are bent with a cartridge joint at one end and a rod end at the other. the triangulation of the uppers keep them from falling over, also, running a poly bushing on the upper helps that as well.
There is nothing wrong with a rubber bushing if they are not asked to operate outside of their Range of Motion. If the rubber bushing is kept within its ROM they are arguably better than a ball and socket joint. They control NVH much better, don't wear (much), don't generate heat (much), don't need lubrication or maintenance and they last a very long time. Exceed their ROM and they will not last the day.
rubber bushings wear faster than Johnny joints, even inside their ROM, they don't control NVH hardly any better
The axle-end bushings in a Radius Arm setup only need to be able to rotate a couple of degrees, well within the ROM for a rubber bushing.
the axle end of the lowers do.
also, the post I responded to was referring to the PANHARD using a bushing, which will certainly see more travel and require more flex than any bushing can handle.