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I have never tried with the panel out but cannot think of any reason the trans would not work, at least to the point you can read the codes which would be next. The grounds for the transmission sensors should be grounded back to the TCM, looking at the schematics nothing is obviously dependent...

The first thing I do is make sure the trans light comes on when the run switch is put into run position, engine not running. If not unplug the wire harness from the glow plug TSU (temp sending unit) so more testing will not fry the glow plugs, passenger side of the front water cross over. If you...

I do not think a 6L80 was ever put in a HMMWV from the factory. (I did though) It should be a 4L80E Here is the troubleshooting guide The first thing you need to do is check the codes, second measure the TPS voltage.