[trit21]

We have removed this coupling with great success. YMMV. Here is what we did. Remove bolts that hold coupling onto transmission. Loosen all clamps, set screws associated with the PSS so you can slid the shaft, with coupling, rearward. Remove the large nut that hold the coupling on the shaft, coupling is tapered as well as the shaft on this end as well. Once nut is removed, reattach all the bolts from the coupling to the transmission and tighten them down, tight. We then used a slide hammer that attached to the prop threads and slammed the slide hammer until you get the shaft to detach from the coupling. Remove bolts from coupling and transmission and the coupling will pull off the end of the shaft. 

Kind of a pain in the butt but I had to replace both my PSS seals earlier this year and that is how it was done. I was there when my mechanic did it and I remember he had a turned down socket so it would fit in the coupling to remove that large nut. He was familiar with this type of coupling so had all the tools ready to go and it went surprisingly well.