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.
Hey you didn't lose the pin, good job. Lol. Make sure the splines are clean and use a little grease them. They should slide back together easily. If they don't it means they are not lined up properly. It's a very close fit. It helps if you have someone inside the car and outside the car. Don't think there is any way to test it until it's back together. Which technique did you use to remove the seal?