M211 correct transmission oil

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Ukrainian Cossack

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Phoenix Arizona
I have recently acquired a 1956 m211 as my first deuce. Having read all threads I could find on the trans. oil it seams there are 3 options for the oil. So still not sure as to witch is best. Have downloaded the military manuals on the 211 and they say 10w engine oil. So I think the military would want a dependable vehicle sence a down vehicle could cost mens lives, Ill go with 10w engine oil. Am I wrong in coming to that conclusion?
 

m1010plowboy

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Automatic Transmission Fluid is 10 wt oil with red dye, anti foam, and friction modifiers added.
That might be the answer I was looking for in my position not to use ATF.

Is there a 30wt ATF?

The manual for our G749 states that 30wt non-detergent oil is used in warmer temperatures and 10wt non-detergent in cold.

If the warm climate fellas are using ATF in summer, would heat become a problem? I'm smelling a pro and con list in the works. with price comparisons and results. We know these transmission don't like heat.

So far we had success following the manual in some trucks and using a product called hy-trans in the newest build a few years back. That truck is working in the bush hauling logs and dead deer without skipping a beat.

That link had some prices so when time allows I'll dig up other costs for ATF and non-detergents for comparison.

The latest truck that we're just starting on has red fluid in the transmission that smells like ATF. Since it came from a pig farm, that fluid could be anything on the shelf that topped up the transmission.....you know farmers. I might get a chance to run it a bit before I go back to what the manual says.

With all the new products out there it's just responsible to make sure the manufacturers understood the internals of the Hydro-matic GMC before dumping their fluids inside. Non-detergent 30wt could have equivalents but after 60 years of running with it, hard to break old habits.
 

Ukrainian Cossack

New member
7
9
3
Location
Phoenix Arizona
I have recently acquired a 1956 m211 as my first deuce. Having read all threads I could find on the trans. oil it seams there are 3 options for the oil. So still not sure as to witch is best. Have downloaded the military manuals on the 211 and they say 10w engine oil. So I think the military would want a dependable vehicle sence a down vehicle could cost mens lives, Ill go with 10w engine oil. Am I wrong in coming to that conclusion?
I have found copys of 1956 chevy truck mauals http://chevy.oldcarmanualproject.com/chevyowner/56tom079.htm and http://chevy.oldcarmanualproject.com/shop/1956sctsm/56sctsm0735 both say type A atf.
doing a complete oil change and found 2 broken gear teeth in bottom of transfer so a new problem to deal with on the plus side Im finding the problems befor Im stranded on the side of the road,
 

Ukrainian Cossack

New member
7
9
3
Location
Phoenix Arizona
That might be the answer I was looking for in my position not to use ATF.

Is there a 30wt ATF?

The manual for our G749 states that 30wt non-detergent oil is used in warmer temperatures and 10wt non-detergent in cold.

If the warm climate fellas are using ATF in summer, would heat become a problem? I'm smelling a pro and con list in the works. with price comparisons and results. We know these transmission don't like heat.

So far we had success following the manual in some trucks and using a product called hy-trans in the newest build a few years back. That truck is working in the bush hauling logs and dead deer without skipping a beat.

That link had some prices so when time allows I'll dig up other costs for ATF and non-detergents for comparison.

The latest truck that we're just starting on has red fluid in the transmission that smells like ATF. Since it came from a pig farm, that fluid could be anything on the shelf that topped up the transmission.....you know farmers. I might get a chance to run it a bit before I go back to what the manual says.

With all the new products out there it's just responsible to make sure the manufacturers understood the internals of the Hydro-matic GMC before dumping their fluids inside. Non-detergent 30wt could have equivalents but after 60 years of running with it, hard to break old habits.
Maybe 10w30 I dont beleve they had multi weaght oil in the 50s might be worth looking into. Its just a idea that might help.
 

USMC 00-08

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Skiatook, OK
Here is another discussion on transmission fluid to look at.

 

M37keppy

Member
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Location
Eldridge, Iowa
I use Case IH Hy-Tran oil in all my g749’s. It’s not cheap but it’s made for heavy use in ag equipment transmissions that have clutch’s and gears and a shared hydraulic system. It’s good stuff
 
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