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remarks 1. The output speed sensor is an tonal type that counts the rotations. If the sensor resistance is out of range it will generate a fault during the ECU BITE on startup. 2. The ECU under voltage and constant power ups and power downs can cause corruption of data, intermittent unrelated...

It could be your TC lock up is not disengaging causing a stall. I think the lock up is at 3rd gear. you could check the transmission fluid to make sure it is not disappearing or contaminated. Replace the fluid, pull and inspect filters for contamination. Lastly you can take to shop to check the...

Take out your keypad/ecu then ring the runs for the turbine and output speed sensors for the correct range. If not in the range it should just be a sensor/wiring repair. For parts I suggest going to an Allison dealer, it may be the same price or a little more expensive but they should have the...

I would suggest checking the ohms of your speed sensors. Your codes 55 56 and 25 give an indication of a speed sensor issue. The tranmission controller knows the correct ratios of the speed of the input vs output. If the input and output ratio is out of range or non existent it may give a...

Thanks for sharing that info, sounds like you figured it out. What did the Allison tech think of using a TID3 transmission with a Wtec 2 controller? The TSM gives some warnings about the controller calibration/ shift adaption for different clutch material. My truck shift pretty hard as well I...

The TMs have a chart regarding the compatibility of harness for WTec III and Wtec II harness. The Wtec 2 manual should also have the same as well. Can you post some pics of the harness pin out, I built a harness for my truck using the Wtec 3 tsm and the electrical manual posted on this site. The...

Sometimes a battery with good voltage may not perform under load causing the bendix to not/slightly engage. Mine does it when the batteries and slightly low causing a grinding noise from the starter trying to engage.

Look at the WTEC 2 troubleshooting manual, the connector part numbers and harness buildup should be there.

Hello all, Do any of the transmission experts know a good way to ID what style clutches are installed for the MD3070 WTEC 3. The two options I see are Dynax and Raybestos for the TID2. Each one requires a different ECU calibration. Chart attached for more info. Thanks

That is an interesting idea what is the max voltage rating for the ones you installed. It would be easier to see a blown fuse than Trying to figure out if the CB is bad

here is a graph I found for temp vs resistance also you might want to check for pushed pins and sockets on the connectors. They can migrate out if the rubber lock is worn. They will not indicate from a visual unless really bad. A good check is to take a spare pin and push the sockets and push on...

What TID # is your transmission and TID # of ECU and first two digits of your CIN on ECU. What temp was your sump during your resistance check of solenoid of 4.1?

Transfer case plug, I don’t know the part no. it is a 10-6 shell size bayonet plug.

Check out Gov Planet item #3664595

Yeah I have wtec 3

Thanks, will contact them see if they can help.

I recently got a 2000 M1078a1 and after doing the receiving inspection the Transmission TCM is missing. I talked to the Allison dealer and they are unable to program a new TCM without the old serial # on the TCM have anyone had any luck with sourcing and getting a TCM flashed? Thanks

IN