I'm having a problem with my 1994 Hilux Surf when engaged in 4H. When moving in straight line on asphalt at any speed, the system works fine. When I make a turn though, the truck seems to lose power and the it feels like the front wheels are rubbing causing the truck to lose power, almost like front wheel hop caused by driveline binding. The truck is completely stock with 265/75/15's, with auto tranny. There's no evidence of rubbing and CV boots are fine. Maybe power steering pump? Any ideas???

This is absolutely normal. It's your drive line binding. You should NOT drive in 4wd on any high traction surface, IE asphalt. What happens is your front and rear drive shafts are traveling at the same rate of speed when your going straight, but when you turn, your front wants to go faster than the rear, but your t-case won't allow for any difference in speed so binding occurs. Newer rigs have a differential in the t-case which allows for some slippage so you can drive on the street in 4wd.

If this doesn't make sense, do a search on the board for "binding" and I'm sure you will come up with better explanations because this is a very common question for a 4wd newcomer.