Remove Pitman arm noting the punch marks on the shaft and arm. They have to match up. Pick out the seal and replace. For you perhaps obtain from Mike Dudek or Eric-Planetman. Will it stop the leak? Probably. Will it last? Possibly. It will depend on how much wear there is in the bottom steering box bush and the amount of movement to the shaft it allows. A lot of movement will damage the seal quite quickly depending on the wear.
If you want to go further there is a refurb kit that provides new bushes and gaskets. Bushes need to be reamed to fit the shaft. New shafts with steering worm, which is part of the shaft are no longer available. Finding a better used box is your only other option.
Oil spec for the box is 80, the rear axle is 90. Use 90 for both. Do not use grease in the box. There are some thicker fluid greases that may feature in replies to this. The idea is that they reduce the leakage and that may be true. 160 that old Jaguars use for instance. Use at your own risk. It is very hard to get this out of the box if you decide it doesn't work. Bearing grease virtually impossible without a strip down.
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