Here's the skinny, 75 k5 blazer, locking hubs, power steering, reg. tires, no lift. When driving the steering wheel is "normal". Out of no where, the truck wants to veer right and you have to compensate 1/4 turn to keep it going straight. It WILL revert back to normal if turned left ( HARD) , but will happen without warning when going straight. Have replaced steering box, pitman and most components under the truck. HAVE looked for frame cracks ( can't find any ) and it is driving me CRAZY. Can't drive it very far. Any Ideas. I have had this truck for over 18 yrs and hate to get rid of it