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Yes, I got a brand new wiring harness kit along with all 4 solenoids and the 2 speed sensors. Still hoping its not the TC itself. After researching, pulling all 350lbs of the torque converter+transmission+transfer case out and in again may not be something I can do in the driveway.

It's definitely not the brake switch. Moving on to the TCM swap

From driving it around for the past 3 years I know the TC should only lock up on 4th D(O). I think worst case the TC is burnt. Yet from the one day where I swapped the internal Trans electronics everything seemed to work fine for a short while so it doesnt seem to be the TC specifically. I do...

I'll hook up a multimeter to it and check, also have a spare lying around. Could just swap it out.

Hi, first time poster long time lurker. I've been sifting through many threads and the Gear-report 4l80e troubleshooting guide on this particular problem but I've not found a solution yet so I'm posting this SOS before I resort to pulling the entire transmission out. My Hmmwv is a 2003 M1123...