While turning in 4 wheel drive, the front and rear wheels need to turn at different speeds. With no slip device in the transfer case, you get exactly the symptoms you're reporting.

In general, you don't want to use a locked 4wd system on clear pavement, and you especially don't want to make a turn under high traction conditions. You will tear up the running gear in a hurry. 4wd is for icy or dirt roads only. On patchy icy roads, I'll often go back and forth depending on the condition of the road I'm on at the moment and whether or not there's a need to make a turn.

[ 10-26-2002: Message edited by: ZFMax ]</p>