As I believe I mentioned before I am only speaking for the AD trucks...and I will admit I only have only spent 62 years fiddling with them. You folks can use corn head grease if you wish. Undiluted it is not correct and not what was meant for the AD steering gear and there is explanation of that by GM. If GM wanted you to use a thick grease, they would have not put a pour-in plug at the top...that much should be easily understood. And they would not have written this in the Shop Manual:
"The steering gear is filled at the factory with a special all-season gear lubricant. Seasonal change of this lubricant is unnecessary and the housing should not be drained. Whenever required, additions should be made using a lubricant which, at low temperatures is fluid and will not "channel" or cause "hard steering" and which will provide satisfactory lubrication under extreme summer conditions."
GM goes on to explain the pipe plug is positioned so as to prevent over-lubricating and that you should never use a pressure gun to force lubricant in the unit.
It is a design issue...the engineers had reasons for wanting it this way. If anybody in the audience is pouring corn head grease out of a grease tube into that hole, please take a video of it. I would really enjoy seeing it happen. Below are a couple of images of corn head grease. It is packaged in a grease gun tube for a reason.
Last edited by Jon G; 09/29/20261:39 PM.
~ Jon 1952 1/2 ton with 1959 235 | T5 with 3.07 rear end
