Is it a good idea to replace the needle bearings in my ball joint front beam with the bugpack urethane ones

unless they are shagged why bother?

I just repacked mine with grease. Apparently replacement bearings are a bit difficult to track down, but I'd suspect that needle bearings would be smoother and work better than urethane.

yea i was told not to bother putting the urethane ones in if the bearings were ok
just wanted a few other opinions