Power steering gear box leaks (pictures)

Wow 2 months. That tough, especially with Spring season around the corner.

So I successfully changed out the seal and will put it all back together Thursday.
Does the gear spline at the end of the shaft receive any special multipurpose grease? Looked like a little axle grease might work there.

Also, any tips putting it all back together or just the reverse order of install?

Can I top off the reservoir with the Lucas power steering stop leak since I have a bunch left, or properly put Power Steering fluid in it?

And most importantly, is there any way to test if the new seal fixed the leak prior to putting everything back together? I hate to have to punch the roll pin back in only to have to drive it back out later.

Thank you to all you guys for helping me get this done my first time. I can’t imagine what shop hourly labor would be doing this.