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NO jjb you are wrong on 2 points, that pdf says the military specifications are still good for military vehicles note number 3, and Allison doesn't list these military vehicles as over the road commercial trucks on their website it list them a specialty vehicles on and off road. Their website list many 15w40 oils as authorized for off road use. So until you can show a Allison document says that a M939 transmission should have something other than 10wt or 15w40 I will completely disagree with your thoughts on the matter.
FXR1969 don't just take my word for it but look at what is listed in other treads there have been others that put ATF in their transmission and had to rebuild it, the only way I would recommend changing to the new transyn oil would be if you had it rebuilt and used it from the get go, that way the clutches would only have that oil in them not a mixture.
The HT and MT transmissions are on highway according to Allison. Also, just because it says you can still use the military spec doesn't mean it won't shorten the life of the trans. They list those oils for specific transmissions and it doesn't include the HT or MT.
Okay read
I never said anything about Dex. I was referring to fluids in the TES295 group like castrol transynd. It's not Dex 3.
This is from Allison.
Still not a fair comparison, not a 6X6, not off highway conditions, and not the trans that is in the M939 series truck. You can do what you wish, after all it is your truck. But you really should compare apples to apples and not apples to cats. JMO
As the document I sent earlier reflects this applies to the HT and MT transmissions. The military approved are for just that the military. They required Allison to approve those fluids for logistical reasons not for longevity.
No jjb you are wrong again the military did not tell Allison to approve 10wt for logistical reasons. You need to back up your statements with documentation which your pdf on fluid change intervals doesn't. You say that the MT, and HT are HWY transmissions that is also not the full story, yes they can be used in a over the road vehicle, but that is Not what we are discussing. We are talking about the on and off road use of military trucks that originally Allison specified 10wt for and backed with a warranty on 35,000 trucks. The military does give rats behind if they need to get more of a fluid it already gets which at the time in the early 80's I believe would have been dex2, which they had to get for the cucv and humvee.
Think about this. Allison says that those fluids are now only approved for military applications. If your beloved motor oil was so good for the trans why would it not be approved for all users?
Because you have on blinders and are wrong they are also for off road trucks get your facts straight the only place that they are not using them is over the road.
Believe want you want. I've talked directly to people at Allison who are the experts. I stand behind my information.
Please by all means change yours out and tell us how that goes. I wish you all the luck with that but I am going to keep using what came in mine and I use my trucks. Like this yesterday.
