Does anyone know if the staked in u-joints are drilled through the cross of the joint? if they are id like to drill and put grease fittings in

 

From my understanding there is no way around these non-serviceable U-Joints and driveshafts and that you will need to replace them. Though I can't answer your question specifically, what I know is that practically everyone with this driveshaft has tried something one way or another, including installing grease fittings.