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The other thing is the truck has less than 7500 miles on it, which I believe is from the last rebuild. It had new batteries put in that have a charged on date of sept 2010. This makes me think that date may have been the rebuild date. I know the truck was not run or moved for a year at least...

I'm hoping that a good long drive will help. This transmission is not slipping in the sense that the engine speed increases but the road speed does not in the same gear. I have had turbo 400's do that at the end of their life, before rebuild. This one gives the extra shift up and down and locks...

Update... We(my son and I) did the drain and fill. It was a little more than 8 gallons that came out. We added 8 gallons to get in the cold range. The transmission had an annoying habit of shifting up to the next gear then immediately shifting back down before shifting back up. It did this...

I'm going to go back and thank everyone that has tried to help me with this decision. One good thing is I've learned quite a bit about oil, about approved oil, and it surprises me that these ratings and specs change, but what is printed on the label may not, making the value of these ratings...

One thing that has been pointed out to me is the clutch plates are saturated with 15/40. How does that work with a switch to TES295? That seems to be a major concern. That leads to the next question. How do the 2 oils mix? How well do they mix in that small area between the plates? I think that...

Gunzy, I can relate to your philosophy for sure. Did you change your transmission fluid when you got your truck? I just mean a change not a switch. I think the military lists a change of fluid every year. I will have to double check that. Once that cost factor is added in, then the initial cost...

JDToumanian, by changing it one time that left probably 10 to 15 qt of original oil in the transmission. Did you notice any change in transmission temperature? Have you put many miles on it since the change and did you notice any other characteristics that changed? Thanks

Gunzy, is your M985 engine any different than a M977 engine? also if your transmission fluid is low, what will you add? One thing I don't understand is the wear patterns or wear conditioning that is purported to be going on with different oils. It would seem to me at least from a logical...

For the engine I changed it to straight 40wt Delo 100 which is specially formulated for Detroit diesels. The truck hasn't been driven off road since it was rebuilt. It is very clean on the underside and I plan only on road use. I somehow missed Swamp Donkey's post until now. He hit it on the...

We can only give what we think and our opinions and I truly appreciate that from those that posted. My truck was originally built in 1984. The properties that are built into todays oils are improving all the time whether we change to an improved version is a choice we need to make. That is why...

Thanks Floridianson, Cool is good, excessive heat is bad. That is all I really know about transmissions and oil. My problem is I haven't run my HEMTT in different seasons/conditions to know if I have affected a change in temperature by a change of oil. I hope others report their results.

I believe in keeping it simple, but I don't like the stupid. I can see where the military wants one oil, or one fuel to fit all, but they can afford the consequences or lay a heavy hand on the manufacturer to keep their lucrative contract. The fact that they can drop in a rebuilt detroit in a...

Thanks simp5782 for your thoughts and the links. I just talked to a couple of guys in my club that have this transmission in their trucks(not HEMTTs) and they run 5-30wt. They said that is what the military runs. Nothing is very clear to me on this. They also said that 3 drain and fills would...

I will also add in response to Csm Davis, I have no maintenance records on the truck. So I don't know what oil is in there. I have seen it stated that all transmissions came with allison approved oil when new, not the military approved oil. There was a hint of pink on the dip stick when I wiped...

I'm not switching to Dextron. I'm switching to the Allison recommended oil TES295. Like I said in my 1st post... I'm not sure what oil is in there. It only looks like motor oil to me. My oil level is just at the bottom of the stick when running cold and only a little higher when hot running. I...

Those numbers of quarts would be for a new transmission or a rebuilt one that is dry. A used transmission will not fully drain. I'm wondering how much will drain and what will that 15w40/TES295 mix be like. Allison says only to drain and refill again after running 30 minutes with the end result...

I've got an unknown oil in the transmission. It looks like motor oil, if I was to guess. It's a very dark amber color. I've read that Allison recommends to drain the transmission, and put on a new filter, then fill with TES295. Then run for 30 minutes, then repeat, which then should give about...