[mustangII460]

Have used lots of PST suff, works great.

Polygraphite is urathane with graphite in it. The graphite is for lubrication. Its simply a stout bushing with lubrication.

I never had a problem with any squeaking? Pure Urathane will deffinately squeak. I can't speak for the shop, but are you sure they know polygraphite?

Polygraphite bushings are WAAAY better than stock. They deflect alot less than OEM. Pure urathane will deflect the least.

Make sure you get spring purches. ....and the upper bushing will ALWAYS squeak on a old Ford.