I don't think it's a joint. I would bet it's an A arm bushing or a shock mount. I greased mine up good last weekend and it still had a bit of a squeak when I got on. I could hold the arm and move the quad up and down and feel a little vibration in the arm. I gave that zerk another shot and it has since quieted almost all the way after riding it.
I have a new set of Garage Poducts bushings ready on the shelf for when they get a tad more warn out.
I have a new set of Garage Poducts bushings ready on the shelf for when they get a tad more warn out.