Here is a picture of the 60. I would suggest some sort of hoist for the rockshaft assembly. It is rather heavy and does not have a symetrical center of mass so it wants to tilt on you when you get it free. The old seal was a one piece. You will have to order 2 new seals and place them on the shaft back to back. You want the fluid in the transmission to stay on that side and the fluid in the PTO to stay its side. Does not hurt to pack a little grease between the 2 seals upon assembly if I remember. Pics worth a thousand words so here they are. I am assuming the 60 like mine will be very similar to your newer model. Also a good time to redo the PTO clutches if they need it and bushings etc.