There is a grease fitting on the front driveshaft, but the rear shaft uses CV joints that do not get serviced. All of the factory ball joints have also been sealed units. As long as the boot is not torn, the grease inside will be safe. Mitsubishi seems to have designed them for easier replacement using bolt in units instead of being pressed into the A-arms. It is not as common for these bolt in units to have grease fittings.