I just replaced the steering input oil seal and dust shield on mine. Where's your's leaking at? They make master seal kits then they have seal kits for just the pitman arm shaft. I had to buy the master kit($44) just to get the two seals I needed. I took the gear box off and used two big pipe wrenches and one good whack to remove the end of the box. To remove the rag joint you need to make sure you take the clamp bolt all the way out and it should come off.
After you get it back on lift the front tire off the ground and steer the tire back and forth to get the air out of the system checking the resivior and adding fluid as needed.
As far as the bottom end of the gear, I'll defer to another member.
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1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs
1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX
1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears
1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now.....
1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone.
1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed.
1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm
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