I have a prop shaft sitting in my shed which has the splines yokes on the end for a 4spd box. Can the end be changed for a sierra item for a type 9 using the same u/j etc?

If not its up for sale.

seirra,s apart from some early ones had a rubber donut,the escort auto one will fit a t9,some sherpa/transit ones are sposed to fit as well.
there are about 2/3 diffo sizes to choose from but they are staked in so difficult to replace.
new props arnt that dear.
soooooooooooooooooo best way is a new prop

Cooking Escort spline is too small to fit anything else, Some but not all Cortina/Capri/Transit splines fit the Sierra box.

Steaked shaft UJ come in about 3 different size widths on Fords -- so hybridising a shaft that way is tricky.