I didn't really mean never-ever-eva but I "never" said I read that anywhere. I've been taught you'd only ever use it in dire circumstances like to get out of being stuck or if towing someone out of being stuck. I was under the impression you'd never drive over say 10-15 mph in it (which I guess is incorrect) so when it was beeping at me I thought that might just be what it does...
And what I mean from 2 to 4lo, was switching the knob straight from 2hi to 4lo while in N. Before I was in neutral and 4hi but it didn't want to engage for some reason, just kept beeping. When I went straight from 2lo it went right in like a Tiger Woods'........putt.