Removal of steering shaft coupling from steering rack

This might work for you. Gather several open end wrenches just large enough to slide over the shaft.

One and hopefully two wrenches will fit and you can use them to pry against each other in the hopes of getting some movement.

I have successfully used this method to disconnect a stubborn U joint back at the ZF selector housing.

Larry

You've probably already done this but ensure the splines are free of burrs and paint. I prefer a 50% ATF/50% acetone solution for rust bustin'.

It may be a stupid question, but you have removed the bolt completely? Have you undone another u-joint so it has degrees of freedom to move?

Thanks for the feedback and sorry for the delay in responding.  Larry, tried your suggestion and it didn't help but a good idea that I may use in the future.  Husker, there were no burrs and the splines were not rusted.  Joules, the bolt was removed in all attempts to remove the coupler.  Tried to loosen the lower u-joint and it would not budge.  Larry Stock suggest loosening the steering rack which worked immediately and he also recommended reassembly with the rack loose.  Thanks again for your suggestions and thanks to George for this invaluable site.