Cast slip yokes? You mean the one that I is on my np208?
My ujoint is a non grease type. Also for something that is sais to be weak, it sure does have similar size, if not the same, size caps as the 1310. Seems to be the same size but everything is closer together.
What I will have to check out is what my current driveshaft size is and see if the yoke end that I have can work for it. I had the slip yoke come with my trans. and they had cut the driveshaft near the end but left it so that I can probably weld it to my current shaft, if it will fit. Hopefully after the swap there will be enough driveshaft left that I can just take the slip part out of it and make it a soild shaft.