[fredjacksonsan]

Sounds like your viscous coupler is going bad. What the VC does is allow slippage between front and rear during some maneuvers, and eliminate slippage in some circumstances.

When it begins to fail, it will cause a little binding in sharp turns, as yours does.

I haven't done this repair, but I understand it's not too bad. Do a search under viscous coupler and you should find a wealth of info.