M939A2 tranny fluid

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pigpen60

Active member
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foley/missouri
Is 15/40 the recommended fluid for the allison in the M939A2 dump truck? Its in Missouri and our weather is all over the place.
 

pigpen60

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Location
foley/missouri
I dont know whats in it currently, I was told it wasnt showing on the D/S and that I needed to figure out what to use. So if its ATF I use Dextron? and if its Motor oil I use 15/40?.
 

juanprado

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Metairie/La (N'awlins)
Change the spin on filter under the hood. Probably needs it anyway and you will know which. Cheap NAPA 1268 or wix 51268 and a qt of whaever fluid you have. Can not remember if it has a fluid sample port also?
 

fpchief

Active member
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South Alabama
Not sure what fluid you are going with but another member found a good deal on full synthetic ATF buckets with me off ebay and also Napa sells buckets of dex 3 for about $65.00
 
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