A box coupling rebuild kit includes a new cross pin and if the original pin is worn it should be replaced. I'm sure some do it yourselfers have serviced the lower end of that steering shaft without concern for the upper end. there are serious pitfalls to that though. The upper end of the column has only a tiny ball bearing supporting the column bells, steering wheel, etc., etc.. Odds that you will damage some other small part up there are not in your favor. There's a turn signal switch and cancel cam, a special isolated contact ring for the horn circuit, and more.
I don't take those quick haphazard routes. I'll pull the steering wheel, electrical components, etc.. while sitting in the drivers seat. Then I'll remove 3 bolts at column to firewall filler plate, 2 nuts and 1 bolt from upper column mount and pull the entire column from the car. At the work bench I'll remove the snap ring at upper bearing, file away any burs or rust from the steering shaft and side the shaft out of the column. Then I can be rough with servicing the pin and box coupling without wondering or worrying what is happening from that tiny bearing up.
If the column has a shifter and/or is 1970 or later model, there are a heck of a lot more small parts to deal with, ignition switch, wheel lock, and more.
If it's pre 70 and floor shift, it's nowhere near as complicated to do it right.
