rustystud
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Come on Frank. Don't lead anyone astray here. You know better.The transmission and the transfer case have no pumps and work in fine fashion when the nasties are allowed to drop out of suspension.
Don't get confused about it all.
Just put straight 30 or 40 weight in it which will not cause problems and alleviate problems, hot or cold.
Gee, did We beat this one all to death yet?
post 286 in here and many other places too
https://www.steelsoldiers.com/showthread.php?85007-M35a2-oils/page19
If you just filled it with pee it would still work Ok for a while, but think about what it is. Think 55 Chevy gearbox.
Gee, how many gears are you flat-shifting into?
If you want it to last another 50 years than search around these forums,
It is the BEST place..............................
There is tremendous differences between a "engine" oil and a transmission gear oil. Especially one that works with "yellow metals" . You didn't even get into the whole "shear" and "compression" values of the oil which are vitally important in any gear oil. That is why I only recommend the newer "Shell" 50W Synthetic Gear oils. The stuff works great and stops all those nasty little problems the Spicer can have like "Seizing" the 2nd gear and the 4th gear to the mainshaft. Actually the 4th gear seizes to the "bushing" which is locked into the mainshaft. Then it spins the crap out of the shaft. All those problems come from faulty gear oil or the wrong gear oil. As far as the transfer-case goes. A good 80/100W gear oil works just fine. Now if your going to be shifting on the fly with the transfer-case then I would again use the Shell 50W synthetic gear oil.
Remember larger gears need different types of oil compared to "small" little units like the 55 Chevy had. You will never see a differential use a 30W or 40W oil unless the mechanic is a total fool. Larger gears need better compression and shear values. Right now there is no "large" truck transmission using anything under 50W gear oil in it. Look it up. I just did. 50W seems to be the "magic" oil weight for larger transmissions right now. I would stay with that.
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