Be careful when using a lube. We race sprint cars and don't lube other than when cleaning or right before the race with WD-40 or the like. Dirt and debris will stick to the lube/grease and grind away the seal (if yours has them) or joint. The rubber seal type is good when new, but they will dry out and crack, which makes the situation worse by holding water and debris. I use WD-40 every couple of months.
I use heims from Rod End Supply, for both my cobra and sprint and they work great. I first used Speedway Motors and they sucked, only lasting 2 years. (cheap Chinese crap) This company does have special grease that does not get hot and fall off the surface.
I use their heims that the "self lubricated" pictured below.
Call Bob Douglas and tell him I sent you.
Toll Free: 800 284 2902
Office: 913 768 1017
Rod End Supply | Superior Rod Ends, Radius Rods & Specially Products