Re: Is it normal?
Sounds like what happens when your transfer case engages in 4LO. Your turning radius being affected means it's likely that your front differential is actually working via the transfer case. I'd start there (i.e. make sure you're in regular drive without 4LO, etc). If that's not it, sounds like it would be a TCM type issue or computer related unless you've never maintenanced your TC, etc.
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