In February I replaced the trans, with a BTS, and at the same time replaced the u-joints in the rear shaft. The new joints are greasable with what looks like a concave disk on the one end. I installed the joints so that all the fittings would be in-line. What I am not sure of now is did lining all the fittings up on the same "side" put the shaft out of balance. I marked everything when I took it off and put it back that way. I have what feels like a small shake to the truck. It's just there, does not feel any different at different speeds. The other question I have, I have been looking to replace the fitting on the joints with real zerk fittings but they are a small size that no one around here seems to have. Any suggestion as to what I need for replacements? I figure if I can get them replaced, I will take the shaft to have it balanced. Thanks for the help.