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Lots of shift adjustments. Even though it's an old system most of the parameters can be reprogrammed.

Another member had their shifts reprogrammed by the Allison dealer. I have the interface but not the Allison software to do it. Still working on that it costs big bucks for the software.

The ecu is behind the keypad. There is a port to the right of the steering wheel. Its an older interface used to access it the Allison dealer should still have it though. There is a bunch of stuff that can be adjusted. Dont take the ecu out unless you really need to.

If you are having issues and want to bypass a relay or some issue where a relay won't engage to start the truck or operate a feature you can make up a small wire with a spade connector on each end and use it to bypass the relay. And here's a pic of the vim box inside. 6 bosch style relays and 2...

Speedo issues with trans shifting issues is more than likely the speed sensor at the bottom of the trans. Not an expensive fix. I hooked up the rda v3 and am able to see it in several programs connected to the truck but can't get any data as of yet. I have the Dana ctis program that says it...

The rectangular diag port is J1708 it is older but not uncommon. There are readers of various caliber available online. I have to load up the software to my laptop and see if I can communicate with it.

The temp sender is above the alternator if the wire is flopping around zip tie it and make sure it's pushed in all the way. Zip tie up the harness it goes to that runs across the front of the engine.

I just dont have enough experience with the trucks to remote diagnose for the overheat. Your best bet would be to follow the tm troubleshooting steps in the manual. Its at the top of the forum under current trucks. Could be something simple like a bad temp sender or loose wire. You can check...

Which tires do you have? The Michelin paddle style are agressive and make more road noise than the Goodyears. It could also be a balance issue. Especially if it comes and goes at different speeds. I ran mine fully floored for 20 min or so on the highway it was only around 78 out but the temp...

Bottom are of trans. It's called engine transmission speed sensor or something transducer depending on which tm you look at. Allison 29543432 is the part.

No speedo is a bad speed sensor on the trans. Its an over the counter bolt on part. I will look in my diag kit I have a cable that breaks down the big round diag connection into smaller ones. The newer diag setup is usb. The older one is a an rs232 port. It looks kind of like an rgb connection...

The a1 models have advanced diagnostics. The transmissions do wind up and bang into gear most military trans are like that. There may be a fluid pressure adjustment that can soften the shift. Changing to the Allison Dex III may help. There is a connector to the right of the column. I have all of...