i had to replace the steering shaft u joint closest to the steering column about a week ago.
we had to take the bolt out by the gear box and take the bolt off by the steering column by the firewall. this gave us enough play to slide the shaft towards the gearbox and remove it.
the shaft that comes out of the gearbox was longer than we expected. just taking the rag joint apart gave us nothing. there was still no room to disassemble the steering shaft. i believe the bolts are pressed in but im not sure.
This is what i had to do. taking the rag joint might work for you. just giving you another option.