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Yeah, I still think it could be air shifter related.
If it were me, I'd make it work in low range and leave it there. I never mess with that splitter anyway.
Of course, I don't usually drive the FLUs on the road.
I'm no expert since my FLUs are always in Low on the splitter, but if it works like a splitter in a truck trans, it can leave you between gears.
From what you've described, it's feasible that it's splitter related, I'd think.