truckernix has it right. Usually you need to rotate the shaft to give the fittings just enough room to get the grease gun on the head of the zirc.
A u-joint should be installed with the grease fitting on the compression side of the yoke. What that means is, as the transmission yoke turns, it pushes on the grease fitting as it tries to turn the driveshaft. You don't want the yoke to pull on the webbing of the u-joint where the fitting is. The other end of the driveshaft is the same only the driveshaft yoke pushes on the fitting as it tries to turn the pinion yoke. The grease fitting should be pointing at the yoke with the most clearance, usually the driveshaft.
Joe, maybe I don't understand, but that makes no sense to me. I'm not discounting what you say, but I have never heard anything about that. I've always installed them wherever the clearance is best for applying the grease.
You can also buy u-joints with the grease zirc in the cap wich eliminates getting u-joint in backwards, and needing the Needle
point attachment.
The crappy part is that I have never been able to grease those flat topped fittings correctly. I believe the zirc fittings are 10-24 and McMaster Carr is the only one I know of which carries them with the round head. The guy at Napa and several other places I called thought I was an idiot when I asked for them (the fittings).
Jeff
