I had something like this happen to me I had the truck transmission in low and wanted to put the 4x4 into 4low, all to pull out a tree stump. It sounded horrible. Then what I did was put everything back. Then tried it with the truck in drive and then to 4x4 lo and not gear grinding. I'm wondering if you do the combination transmission low and 4x4 lo.
I think if I were you is to keep the truck in drive with the foot on the pedal and skip the truck being in "N".
I think if I were you is to keep the truck in drive with the foot on the pedal and skip the truck being in "N".