![]() ![]() I also read somewhere that people are now using a full synthetic oil (I forget the brand name) in their rockwell axles as they run considerably cooler.Īlso, just for comment, back in high school we used to flip the diff covers of our 3/4 and 1 ton GM corporate axles (nobody in los angeles knew of IH) which allowed the addition of several more pints of oil. Perhaps it would last forever, but the transmission was extremely difficult, if not impossible to shift, as the oil never allowed enough friction to allow the syncroes to engage. I recall hearing a story once where someone put an ep oil in their transmission, believing that if it held up to the high pressure in a differential, it would last forever in a transmission. How can one oil meet both requirements better than two purpose-designed oils? And that oil would last 100k miles, unless some type of positraction was used, then its a whole different story.Īnd I was taught that a manual truck transmission should never use an ep oil, but only a 85 or 90 wt gear oil. ![]() In the past (when dinosaurs roamed) I was always taught that a rear differential in a truck, such as a 1 ton truck, for example, should only use an extreme pressure rated oil, such as a 160wt ep, due to the sliding action of the teeth of a hypoid spiral bevel gears differential. The 210 formulation does not contain an aggressive sulfur compound and is compatible with yellow metals, not too many other brands have that capability, so my advice is not to go to napa and get a gl 5 gear oil for use in all of those boxes. IHPA uses and stocks the swepco 210-80w140 gear oil, you can purchase it from them by the gallon, but you won't won't find it at a napa store. I only mentioned it to clarify sp for you. A later version of automatic transmission oil for Ford pickups is "sp" but that has since been discontinued and is replaced by "lv" - don't use either of those because it is not close to a gear oil specification. The "type sp" you mention is not recognizable, looking in the check chart "sp" is designated to be a speedometer cable lubricant. To simplify your needs, you can use swepco 210-80w140 gear oil in all of the applications you mentioned, it is a true "multi-weight" gear oil and will meet all the specs called for in oils from 80w90, 90, 85w140, and 140, and is much more energy efficient than the straight 90 which is called for. The mil 2105 gear oil spec is the same as a "gl-5" gear oil. They do not contain ep (extreme pressure) additives. ![]() The viscosity of both of those oils are the same. The recommendation was for either straight 90wt mineral gear oil, or straight 50 non-detergent engine oil. The straight mineral oil in question was recommended because of yellow metal compatibility in those gearboxes. I am ready to just put some 75w90 api gl-5 gear oil in the diffs and some 50 weight engine oil in the tranny and transfer case unless I can find some better info here. What can I pick up at the local napa to meet these requirements? Is 'straight mineral oil sae-90' gear oil or engine oil? What is sp, maybe standard pressure instead of extreme pressure? No one seems to carry it as described per the manual. ![]() Ra-16 rear differential: 5-1/2 pints sp type lubricant, sae-90 per mil-l-2105b (no zinc) Tc-141 transfer case: 6-1/2 pints straight mineral oil sae-90įa-15 front differential: 4-1/2 pints sp type lubricant, sae-90 per mil-l-2105b (no zinc) T-419 transmission: 7 pints straight mineral oil sae-90 Per the user manual and service manual, a 1200d should be running the following oils: What are the proper 'current' oils for a '70 1200d transmission, transfer case, and differentials? I refuse to believe this hasn't already been addressed here, but searching has yielded nothing useful (except a reference to michael recommending 50 weight engine oil for the transfer case). ![]()
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