John Deere corn head grease,it is thin enough to flow into gears but thick enough to not leak out worn seals
Watch the video:
https://youtu.be/UEwk_sYP6A8The manual steering gear lubricant is GM #12377985 available from most GM dealers, also look at places that sell early Corvette parts for the GM stuff and they sell a hollow bolt for the top plate with a zerk fitting to get it in the steering box.
steering box lube holes.jpg
63-82 Steering Box Greasing Tool.jpg
You do not have the required permissions to view the files attached to this post.