If the box is still tight and only leaking from the pitman shaft just change the pitman shaft seals, you can do it without removing the box, the last one I did was less than an hour start to finish. You will need a pitman shaft seal kit and a top gasket. I don't have part #s, the parts were around 35. 00 from Dodge.
Clean everything around the top plate and the lower seal.
Center the steering wheel.
Remove the pitman arm.
Clean the grease from the seal cavity.
Put a drain pan under the box, remove the four top cover bolts then remove the top cover and pitman shaft together.
Remove the snap ring and the old seals, you can push the seals out from above through the bearing with a small pry bar, they are rubber coated and fairly easy to push out.
Clean the seal bore and install the new seals and snap ring.
Completely fill the space between the seals with the grease included in the seal kit.
Put the new gasket on the top cover and install the pitman shaft, top cover and bolts.
Fill the cavity below the seals with the remaining grease.
Install the pitman arm and bleed the system.
If you dont disturb the adjustment screw it wont be nessesary to re-adjust the overcenter.
The hardest part by far was removing the pitman arm, if you can get that off the rest is easy.
Jared