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I thought I'd read up on all of the most recent threads here, and figured the concensus was that Dextron was the way to go. But I've found a few now that talk about overheating with Dextron. I'll drain and go with 15w40 from now on.

Thank you. There are sites like Eastern Surplus that sell MT654CR transmissions, and their list of compatible truck models includes the A1 and A2. https://www.easternsurplus.net/PartDetails/2271/9M-168-Automatic-Transmission-Allison-MT654-M939A1-M939A2 I assume, then, that they probably listed...

Hello, I have an M923A1 with 23k miles, I noticed the transfer case was running hot, so I changed the gear oil in the case, and then figured I'd change the oil in the transmission as well (used Dextron). After towing an ammo trailer around for the day, I went back to park, and the truck won't...