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???