Can't disconnect my steering box??

If im understanding what your trying to do, i just did this so i could change things out on a 73 sport a couple days ago, there is another really small pin at top of the coupler it sits flush with outside of coupler but sticks into one side and catches. You have to take the top cap loose and slide up on shaft to see it. once you get this very small pin pushed out flush with inside of coupler the coupler and box should come right off. other wise just take loose and drop the column and slide it back into the car some and the coupler will come off the splineson the box. hope this is of some help and that im understanding what you need. but stay tuned because im sure someone else might have a better idea or some trick of some sort. theres some really helpful people here.