My experience is that John Deere Corn Head Grease is not quite fluid enough for steering gear boxes. I had filled the box on my '37 Master coupe with that product a few years ago. When I took the box apart last year to rebuild it it was obvious that the grease had not flowed and lubricated the gears. There were channels and cavities or pockets where the sector gear had traveled.
After I completed the rebuild i filled it with the Penn-rite. I recommend that you really need something with the consistency of a NLGI 00 grease. It will flow better than the corn head grease. I also agree that you can do just as well mixing your own concoction of grease and gear lube.
