Technical STP for Steering Box Lube?

We use semi-flowable grease 00 grade , it is used in heavy truck wheel bearings and the bearing cover have no hole cover . So you can’t put 90-140 in it . If you stick your finger in it ,it will leave a hole , but as you watch , it will very , very ,slowly fill up. And to install it fill a sandwich bag and just cut off the corner and squeeze it in. ANDY the truck doctor should know all about this stuff ,,, tell “em bout “it andy !!!

 

ebay has power punch but its a fragrance! for gas tanks. Amazon has power punch but its nutrients for cattle. Where do you guys buy it?

 

Start at powerpunchinc.com

My dad would buy a 4 gallon case at a heavy truck parts place in Lathrop, Ca.

 

From what I have read most of the corn head grease is an extreme pressure lubricant which I think is what Ford recommends. I also learned that using 600w without additives in the older boxes is recommended because some of the modern additives can actually damage bronze bushings. Some vintage auto restorers use Penrite 1200w. What ever you use seems it should be self leveling.

 

The oils to avoid for anything that has brass or bronze parts are anything that bear the specification API (American Petroleum Industry) GL-5.

GL-5 gear oils are those that are most commonly used for high-pressure applications such as differentials.

Gear oils with that specification contain chemical compounds that adhere to steel, to give wear resistance. Unfortunately, those same compounds erode brass and bronze.

GL-4 gear oils are those that are most commonly used for medium-pressure applications such as manual transmissions, steering gear boxes, etc.

So, SAE 90W-140 is not an acceptable substitute for ISO (International Standards Organization) 600W, for a an application with brass or bronze parts, if it is GL-5.

If there are brass or bronze parts present, the gear oil, in any application, must be GL-4.

Unfortunately, before GL-5 existed, and became the standard of what is found in the auto parts stores, nobody bothered to put API GL-4 in a service manual, because GL-4 was the standard.

Improper application of GL-5 led to a whole lot of warranty claims, and unhappy customers. It also damaged the reputation of many good transmissions over the years. Many complaints about the AX-5, AX-15, and the NWC T5 stem from using the wrong specification of gear oil (and, in the case of the NWC T5, that and the wrong weight/viscosity).

FTR: Penrite 1200w is ISO 1200W. It would be roughly SAE (Standard of American Engineers) 250W.

Here in the US, we have a NIH problem (Not Invented Here). We will use everything up to and past the size of armadillos, and the weight of baby elephants to avoid using the Metric system, or any international standards.

John Deere Corn Head grease is a whole other animal. It is not even classified as an oil.

As such, it is not on the SAE, or the ISO scale. It gets its very own standards organization, too!

That product is rated by the National Lubricating Grease Institute. They have expanded, at least, to 31 of the ~200 countries around the globe.

 

Thank you for posting this technical information in detail on the specifications and standards. A lot of folks may not be aware of these important differences and choose the wrong products for their application. As they say the devil is in the details.

 

thank you

 

Who can forget ole' goose grease himself at Indy. Ever wonder why that $6 bearing failed?

 

We used atf for burnouts.....

 

Reading through this while rebuilding my 39 box. I was gonna go with the cornhead grease, which is NGLI 0 but noticed the sta-lube assembly lube I’m using is NGLI 0-1/2.
Anyone ever tried this in a steering box? I have it, so…. I’m considering it.

 

- !!! THANK YOU !!! -
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And it doesn't leak .

 

Lot of vintage racers especially the British car guys used STP in their lever shocks