Grease fittings are a good thing. The original Ujoints have a set screws that can be removed and a 1/4 20 fitting can be installed. An occasional shot of grease from one of those disposable mini grease guns (limited space) should insure a lifetime of service. On the 740 cars a hole needs to be drilled in the plate blocking a straight shot at one of the fittings once installed; a step drill can be used with the plate still in place.

If I had to replace one Ujoint I would probably replace them all.

Be SURE that the segments of the driveshaft are reassembled with the same orientation to each other to help insure proper vibration free service. Mark them in some way (file marks, center punch dimples, etc)so there is no question. If you have the Ujoints installed at a shop be sure they understand this and check their work before you leave the shop when picking up the finished assembly.

Randy