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Possibly check and see if your oil is C4 certified it will probably be fine either way, I wouldn't think the difference between 10wt and 15w40 is going to be a lot the main difference I see is detergent additive not sure how much that will affect the transmission. If I could not find any 10wt...

Look for ISO32 or AW32 hydraulic / transmission oil

They all started with 10wt.

200,000 + 18,000 weight on fifth wheel

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.

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.

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...

Okay read http://www.allisontransmission.com/transmissions/vocational-applications/specialty I will back up what I say Also your own pdf list the HT and MT as using the military spec read note number 3. (3) Military specification fluids are approved for use in Military Applications in 3000...

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...

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...

Okay jjb I understand what you are getting at and I am not trying to mean or argumentative but hopefully save you and or someone else the money of a transmission rebuild. If you are going to be running up and down nothing but asphalt and not putting a heavy load on your truck go for it run a...

And it doesn't back up your statement. The only mention of the MT is that it can use the military spec fluids.

jjb your own list shows military spec fluids are accepted in military trucks, also these trucks didn't start life with 15w40 which was chosen to make logistics easier they started life with 10wt which at the time was chosen because of the hard use they were expecting the trucks to endure. If you...

10wt is what it came with from the factory and the military changed to using 15w40 for easier logistics, bet you good money none were drained and refilled just to change from one to the other.