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On the way home from buying it, an engine sensor failed. We were out of state at the time, and had no way to troubleshoot it on the side of the freeway, and so had to have it towed to the nearest CAT service center. Tow cost $500 for about 11 miles, and the repair was another $500. The second...

Worked for me too. Thanks so much.

We bought our 2003 LMTV in the early summer, and it's been on the side of the road twice since then. I know some bugs always have to be worked out, but these failures have made us think about the use of this truck going forward. We used to take our M35A2 into the forest to get firewood, and...

This, I hope, is the final post on our transmission failure. When we discovered that the C6 thrust bearing came apart inside the transfer case, we decided it was necessary to take apart the whole transmission to see where the bearing parts went, and if there was any additional damage. Once...

We were able to get our MD3070 transmission out, but with great difficulty because of the frame crossmember at the back of the transfer case. Getting both ends of the transmission/TC free at the same time so we could drop it down was a bear. Not looking forward to trying to fit it back up...

The LMTV/FMTV parts spreadsheet (https://docs.google.com/spreadsheets/d/1U0XMs6blh-7a6B3IIe-A7GKcAHEj5-6hZEghH_jddgw/edit#gid=0) and an old thread on here (https://www.steelsoldiers.com/threads/lmtv-m1078-transmission-fluid-change-to-atf-write-up.149271/) say we can use Mobil ATF D/M when...

I also want to give a shout out to Xcalliber Transmission (https://www.xcallibertransmission.com/commercial-home/) for selling us a good used C6 cover (what the arrow is pointing to in the pic), since ours was all carved up on the inside. It was still expensive (~$780), but a lot cheaper than...

We ordered a replacement for the C6 thrust bearing that came apart. When it came in, we were mystified that instead of a bearing, Allison handed us a composite washer that looked nothing like the bearing that failed. Allison gave us an information sheet showing that the C6 thrust bearing...

Would you mind letting me know what your transmission cooler flush procedure is? We had the C6 thrust bearing destruct in the transfer case of our truck and we need to flush out the transmission cooler before putting things back together. We think most of the bearing parts are stuck inside and...

We took the transmission out of the truck and started taking apart the transfer case to try to figure out where the bearing parts came from. There was considerable damage in the C6 clutch housing. One of the reaction plates had a section ripped out of it, and it carved out the inside of the C6...

IN

Here are some links to other threads with a similar issue. I think this is the one Suprman was referring to: https://www.steelsoldiers.com/threads/my-1079-transmission-saga.170421/ https://www.steelsoldiers.com/threads/m1078a1-2003-bad-transmission-problems.147899/ Some discussion about...

Do you happen to know already which bearing came apart? Where the roller bearings came from? We have talked to an Allison service tech and looked at the parts diagrams and can't figure out where in this transmission there are bearings this small. The threads I have found on this topic also...

Thanks for the reply. Our truck recently got the same transmission codes you did and our output speed sensor also has roller bearing pieces stuck to it. I am interested in hearing what you've learned. Thanks again.

What was the outcome of your fix?

Just experienced this with a CAT 3126 M1078. Intermittent loss of power, as if the engine were stumbling and maybe not getting enough fuel, though the frequency and duration of the stumbling had the feel of something electrical cutting out. It got more and more frequent until the truck would...

Thanks again for all the replies. I called Wagner Equipment in Denver, and Chris in the tech department told me the following. The 3116 has the altitude limit sticker to let you know what altitude the rack and injectors are set to operate at. At higher than max altitude the engine will be...

Thanks all

Greetings, I am looking at a 97 M1078 with the 4922ft altitude limit on the engine sticker (3116). I have not purchased it yet because my house sits at 6900ft and anywhere we would take the truck is higher than that, up to about 11,000ft. I read the thread above, but am still concerned about...