I don't have a pitman arm puller, so I measured the splined shaft part of pitman spline in box and get 1.56".
Loaner or cheapo HF look like this one but jaw opening is not enough to clear spline on box
https://www.harborfreight.com/tie-ro...ler-63684.html
loaner tool is 1 3/16" jaw opening ...looks to small. Not finding larger size jaws...?
also in searching input shaft seal kit for my 72, the part # is not what link shows in post 2. Its Edelman 7095 when I look up on AZ or Rockauto. The OP posted this so just get the seal kit for your specific year.
Just circling the wagons for parts &tools before I pull box. I do have a pin spanner and snap ring pliers.