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I'm not at all fussy about what I use in the differentials. They are open differentials, so there is no need for funny stuff like with limit-slip. I am perfectly happy with the stuff that is blended up for tractor supply, and I would imagine the walmart, or pepboys oils would be fine too...

What I do, and you can take it with a grain of salt, is run Rotella 15W40 in the engine, GL5 in the differentials, and Traveler (tractor supply) brand SAE40 detergent oil in the transmission and transfer case. I use silicone brake fluid, and the latest revision of GAA grease for the chassis...

I'm sure the oil you bought will work ok. The whole point of this thread is the manufacturer of the transmissions and transfer cases still says not to use Extreme Pressure (EP) gear oils in their boxes. They recommend using plain old SAE50 motor oil. Why is this? Mostly because the EP oils...

Actually, Paul it would strongly appear that you are wrong. GL-5 is not adequately lubricating the 2nd gear's bearing when the truck is going fast in 5th gear. The gear has been modified a couple of times to improve things, as evidenced by the variety of differently designed gears found in...

No, they are not... but then Exxon, is not Esso, and BP is not Sinclair, and Detroit Diesel is not GM, and White is not Hercules, and Verizon is not Ma Bell... well the list goes on and on. These companies all are different from the companies they were in the 1960's, when the deuce was...

Hi Paul, I have read those pages in several different revisions of that document, and my read is a little different ( Imagine that! ) : 1) Meritor wants only SAE50 synthetic used in their new transmissions and transfer cases.... a reasonable suggestion given the improvements the synthetic...

First, there are two main organizations that deal with lubricant standards. National Lubricant and Grease Institute (NLGI), and American Petroleum Institute (API). NLGI deals primarily with greases, and API deals with oils. As I understand things (I don't know much about NLGI), API is funded...

I'm just curious, Paul.... Since you have made it abundantly clear that there is no document other than a US Army LO that will convince you that GL5 might be a suboptimal lubricant for use in civilian owned deuce transmissions and transfer cases... And further, you have made it quite clear...

Because the transmission/transfer case manufacturer has no control over how the different additives from different oil vendors may fight each other, they ALL will recommend that you not mix oil types and brands. Because of all of the nooks and cranny's in a transmission/transfer case, and...

Hi Paul, This whole thread is nothing but slips of paper really... both sides of the argument. Just to add some spice, let me add some anecdotes that I lived through... not the active participant, but his helper. To set the stage: My dad had an IH truck that had a Borg Warner 3 speed...

They put the oil canisters upside down and above the oil sump level against Hercules's recommendation, they used bobble head valves on gear boxes, transmissions, and differentials, without providing a means for equalizing pressure after cool down. The Army does lots of things that are dumb in...

Casual observation shows that the government has been moving steadily to simplify its supply chain for years. At one point, there were multiple fuels (mogas, diesel, jp), multiple engine oils, multiple gear oils, multiple greases, and multiple brake fluids. Now there is one diesel type fuel...

Let's not get too anal here Paul, I said SAE50 motor oil, not SAE50 maple syrup. The synchronizers are clutches, and rely on the oil making them have a certain amount of friction, for their operation. If you use an oil that is too slippery, the synchronizers will not spin up the gear clusters...

The simplest bit of information that should sway you if anything will is that Spicer, the maker of the transmission, says not to use oils with EP additives in their transmissions. GL5/MT1 is full of EP additives. Spicer specifically recommends using SAE50 motor oil. SAE50 is the same...

It will work. It isn't the best oil you can buy, but it is a good straight mineral oil that is typical of the oils made when the deuce was designed.... That said, modern oils are so much better than the oils that existed when the deuce was designed that they almost single handedly tripled the...

Hi Jon, That is right, SAE 50 engine oil (meant for an engine) is not functionally the same as SAE 80/90 gear oil. The mineral oil base is, but the additives put into that base are meant to handle vastly different conditions.... For example, engine oils generally run in a much more severe...

Hi Westex, It is simple, if the SAE is less than or equal to 70, it is motor oil. If the SAE is greater than 70 it is gear oil. The viscosity ranges of motor oils, and gear oils overlap. Here is a table that will show that: Motor oils SAE 10W - 41/6 cST SAE 20W - 71/8.5 cST SAE 30 -...