Remove the large nut and washer and tap or use a puller to get the yoke out. It isn't press fit so it shouldn't be too hard. The install can be really tough to do right, as right would entail removing the seal, outer pinion bearing and crush sleeve, installing a new crush sleeve and re-tightening the "new" pinion nut to get the proper preload on the bearings. That said, I have done it on the cheap by counting the number of turns it took to get the nut off by using punch marks on the nut and pinion shaft end put there before loosening the nut. IF you use the old nut, you then can put it back the same way using red loctite and line up the marks + a small amount on the nut when you torque. Don't be afraid of 125-150 foot pounds to get this. IF you are just replacing the seal this can work well provided you are clean and methodical in your reassembly. IF you are also replacing the front bearing, it gets more complicated as the crush dimensions can change. I'm not advocating this method for the inexperienced, but it can be done with satisfactory results. Your results may vairy.