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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...

We found the problem! Actually my son did. The wire labeled "rear left" coming from the switch should be attached to wire 1003 not wire 1294 the wire that was attached to 1003 was the brake stop. So we changed the 2 and it works right. Simple as that! This truck probably never had a left turn...

Since it was looking like a turn signal switch problem, I took the switch apart. It looks brand new inside, nothing has gotten hot, it looks perfect. I put it back together and pulled back the dash. The white wire coming from the switch is labeled "left rear" it was plugged into wire #1294. With...

Simp5782, Did you have power at the trailer plug when you jumped it? I could not find any for the left turn at my plug. With my left turn off and the brakes on, I have brake lights. When I go left turn on at the switch both brake lights go out and the front stops blinking, it goes solid on, on...

Snowtrac, We had to reassemble so we had the turn signals grounded. With the brakes on, both brake lights are working. Then when the turn signal switch is moved left turn both rear brake lights go out and the light on the dash goes solid on-no flash. When turned to right turn with the brakes on...

Thanks snowtrac, I was wondering about separate contacts in the switch. I hadn't thought about how the brake light is turned off when the turn signal is applied but the turn signal switch makes sense where this happens. I don't think we tried both brakes and the left turn at the same time, but...

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...

This problem kept us from taking the truck to an event yesterday and my son and I are at the limit of our understanding. So I'm asking for help. The left rear turn signal does not work. Every other lighting function does. Brake lights work, the front left turn signals work, the right side all...

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...

SB645 passed the State Senate, passed the House and was signed by the Gov. It includes HMMVW's to be considered special interest vehicles, so they can be driven on the road to events, parades, cruise in, or a sunday spin. It takes effect 1/1/2018.

Does anyone know the napa or delco number for the starter solenoid? I couldn't find it in the Wiki. I'm looking for the solenoid on top of the starter. I believe it is activated by 12 volts but handles 24v. I have a 24v direct drive starter. Thanks