Don't trust low grade non-greasable U-joints the next time you have to change yours out.
Ours come complete with zerk fitting to insure proper lubrication throughout and longer life.
Works for front or rear driveshafts. Good to keep on hand for spares on the trail too since Ujoints don't have a tendency to go out in your driveway or near a parts store. They go out on the trail and you're screwed unless you have spares on hand.