Can confirm. 6l80 does have a tcm in the pan. And it needs a LOAD of data from the E38 Gen iv ecm. I put a 6l90 behind my Gen iii motor with a stand alone controller from PCS. 10/10 would not recommend. It has been an expensive and time consuming exercise to get it running 80% as good as it could run. I would recommend a 4l80. It’s a th400 with overdrive. If you want to avoid the computer control stuff…put in a manual valve body.6l80/90 does have the controller in the transmission pan however it is pretty tricky to get working without the matching E38 ecu; general consensus is not worth it without the LS engine from what I've researched. There was a 200r4 on KSL the other day I think?
Found it: https://classifieds.ksl.com/listing/68860112
That's been a pretty strong possibility as well. Looks like I'm about $2500-2800 for that?