Pitman Arm Installation

[mmsidaho]

I'm working on a 1972 C10 restoration I started several years ago, and I don't remember how far the pitman arm slides onto the splined shaft of the steering gearbox. In trying to install the new pitman arm, I can only get it to a point where there is still 3/8" to 1/2" of spine showing between the pitman arm and what would be a tight fit to the bottom of the steering gearbox. I've torqued the heck out of it with a 3/4" drive wratchet and socket and I blieve I've got the threaded end of the splined shaft coming out below the nut. I'm at work and don't have any pictures right now, but could take some later on.

Any idea if this is the normal spot where the pitman arm belongs? I'm almost afraid of what it might take if I have to force it any further up the splined shaft of the steering gearbox.

Thanks.