HI Tiny!
Near the end of this older thread is a post I made about the JD Cornhead grease. Like you, I had read all the posts on this and other forums stating that the JD grease was the "hot trick". I was really disappointed when I opened up the box on my car.
Steering Gear LubeI'm not saying that the JD Grease is bad. My observation is just that there are better lubes for this application. Using the JD grease is so far ahead of no grease that I would not be concerned. Plus the reality is that 99.99% of us will never drive the cars enough to wear out anything.
Another point is that my car is a Master so it has a pretty cheap and crude steering gear. It is just a worm gear running on a sector. That gear interface has high face pressure and friction. So I really wanted to make sure there was lubricant between those gears.
If I remember correctly your car is a Master Deluxe. Even though it has been converted to a straight axle I assume you still have the Master Deluxe steering gear. That design has bearings that allow the sector to rotate as it moves along the worm. That reduces gear face pressure and friction.