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The Sequential Four Ball Test Drew Troyer Tags: oil analysisUse it to Evaluate AW / EP Performance The plant oil analyst is responsible for ensuring the continued effectiveness of lubricants in service and is often involved in the lubricant selection process. In the case of antiwear (AW)...

Glad this is helpful. There is a ton of misinformation in the world. Happy that I am doing my small part to dispel it where possible. This exact same debate runs high in the Dodge world as well for what that is worth. As for fluids, I would always go with what the latest recommendation is...

You are absolutely correct that things change. What we call gear oil today and what it was 75 years ago are not at all the same. The API has three current and three discontinued (as of 1995) grades of gear lubricant as it is more appropriately called. If you use a GL-5 rated oil in an...

So, let's start with your first "ASSUMPTION". You are flat out incorrect. 'nuff said on that point. But, ASS-U-ME away if you must :-P. This whole discussion is about wear protection. So please, do not insinuate that I am stating anything less than "wear protection is required". Honda...

There have been many instances where a manufacturer has specified motor oils for manual transmissions. Many many motorcycles share not only their oil sump and gear box, but their clutches are "wet bath" sharing the same lubricant as the engine. Not sure if you have ever seen this regarding...

Sorry, I have to disagree with a number of these points. 1. No synchronized transmissions shift gears to my knowledge. Instead they engage a synchronizer (typically a cone type device that couples the gear to the appropriate shaft in the transmission made of a much softer sacrificial...

Because I am NOT stating that. My exact quote is: "So, hope that provides everyone with a better understanding of why ATF is a suitable lubricant for a gear based NP205, but why gear oil is not suitable for use in an automatic transmission." Suggest we all read these postings a little more...

I think these are great questions. Unfortunately I know I don't have the specific answers and none of us really can know without some form of communication with the manufacturer/engineers at the time (which would include documentation from them). Clearly GM AND New Process/New Venture...

Not sure if you saw it, but I attached the page from the Chevy Service Manual. That states 5.2 pints or 2.6 qts. There are errors in the TM's.

Rebuilt my first at 15. Was a TH350. Lost count after 20 ... All the best!

ATF is suitable for gear based transmissions and transfer cases Well, since you asked so nicely. Non-Newtonian fluids in a nutshell defy the expectations of the observer. How could a seemingly thin substance like ATF Hydraulic Fluid protect against shear loads you ask? Well, for simplicity...

Thanks, Do you know when they began to add these? Did they work?

Pretty much this is the correct answer: "In the 1950s, 1960s, and 1970s, ATF contained whale oil as a friction modifier. But since whale oil would break down at higher temperatures, cars produced in the 1970s and later would not be able to use whale oil because of the higher engine coolant...

Shear resistance of Newtonian vs Non-Newtonian fluids Well, I'm just going to go out on a really shaky limb here and say, if it was feasible then the answer would be yes. You pretty much answered your own question.:grin: It is commonly misunderstood that the shear strength of a fluid is...

ATF Thermal Analysis Some additional "light" reading on the thermal analysis of ATF's in actual use. In case anyone is bored and looking for something to do :razz: https://bobistheoilguy.com/automatic-transmissions-study/ As you can see, ATF's are pretty stout.

Hey folks, this is not intended to resurrect "the great debate" relative to people's opinions on what should be run in the NP205. Instead I provided the inquirer with a clear and irrefutable set of facts from the vehicle manufacturer and fleet owner on what they specified for use. It is true...

Yes, according to the -12 Lubricating Order Dexron II at 5.0 qt or 4.7 L. Also, in the 1986 Chevy Pickup Trucks Service Manual, Page 7D1-6 205 Transfer Case - Dexron II