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When I shift into 4Lo I get no 4 wheel drive. 4Hi works. Did have a/c redirect to defrost a couple of times. I remember something about the air redirecting having something to do with not having 4x4 but don't know just what it was.
I always stop, apply brake, put in neutral, and then select ether hi or low range, wait for actuation and go on my way. With low range it just would not engage, it went back to two wheel drive.
Found the problem. At the tranny there a shifting unit attached to the tranny. Where this unit attaches to the shaft there is as alignment mark on the shaft and another on the shifter. These marks were about 1/32 inch from lining up. Adjusted shifter and all is good now. Even my reverse lights work normally now.