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Having previously soaked the ball nut and wormshaft in gear lube, add some grease to the shaft and teeth. When it comes time to fill the assembled and installed box, Sam at Harry's Steering Gear Repair recommends a gear lube/grease blend. You want a thick liquid, not a thin paste. It should be pourable. This viscosity will handle the load yet not be so thick that it becomes stiff and flakes off the moving parts; nor will it be so thin that it seeps past the rubber seals. Place the well-greased upper bearing on the wormshaft and ball-nut assembly and insert them back into the housing.