I "borrowed" this from another site (was posted years ago):
"The steering column in a Jeep YJ is called a GM Saginaw column.
They are the same column that was used in the 80's chevy products (before air bags) and in the Jeep XJ's as well as some of the 80's-90's Toyotas.
Columns will switch from tilt to non tilt, and are just plug and play. Providing that all the switches are already on the column you are switching to. As for off brand columns...i.e. chevy, Toyota, the only thing that needs changed is the flange that bolts to the firewall."
I've also read a number of posts where folks have stated that it was a 1-2 hour job to swap 'em out. I haven't done one on a Jeep, but have done other vehicles. Some are more difficult than others, to be sure. And btw, it appears that the tilt column was an option for all years of the YJ, so there's that.